TY  - CONF
AU  - Dojčinović, Milena
AU  - Vasiljević, Zorka Ž.
AU  - Rakočević, Lazar
AU  - Pavlović, Vera P.
AU  - Ammar-Merah, Souad
AU  - Vujančević, Jelena
AU  - Nikolić, Maria Vesna
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7269
AB  - Mixed spinel ferrites MgxNi1-xFe2O4 were synthesized via sol-gel combustion synthesis with citric acid as fuel, followed by calcination at 700 °C for 3 hours. Obtained powders were characterized via X-ray diffraction analysis (XRD), X-ray photoelectron (XPS), FTIR and Raman spectroscopy and FESEM microscopy. Elemental composition was examined via energy dispersive spectroscopy (EDS). Humidity sensing properties were tested by measuring AC impedance in a climactic chamber at 25 °C and in the relative humidity range of 40–90%. Temperature sensing properties were tested by measuring DC resistance at 40% RH in the temperature range 40–90 °C. Synthesized powders were proven to be pure spinel Fd 3m phase with spherical, slightly agglomerated particles. Substitution of Mg with Ni results in structural changes such as a change in inversion parameter and particle agglomeration, which influences sensing properties of the material. Results show that the sensing properties of magnesium ferrite, which is already a well-established NTC sensor, can be improved by incorporating 10% of nickel in the spinel lattice structure. Mg0.9Ni0.1Fe2O4 exhibited higher temperature sensitivity and higher sensitivity towards humidity compared to MgFe2O4, while further substitution of Mg with Ni resulted in the decline of sensing properties, increase in particle size and agglomeration degree.
PB  - University of Novi Sad, Faculty of Technology, Novi Sad, Serbia
C3  - CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, Programme and Book of Abstracts; October 11-14, 2023, Novi Sad, Serbia
T1  - Magnesium substitution with nickel and its influence on the sensing properties of MgFe2O4
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7269
ER  - 

@conference{
author = "Dojčinović, Milena and Vasiljević, Zorka Ž. and Rakočević, Lazar and Pavlović, Vera P. and Ammar-Merah, Souad and Vujančević, Jelena and Nikolić, Maria Vesna",
year = "2023",
abstract = "Mixed spinel ferrites MgxNi1-xFe2O4 were synthesized via sol-gel combustion synthesis with citric acid as fuel, followed by calcination at 700 °C for 3 hours. Obtained powders were characterized via X-ray diffraction analysis (XRD), X-ray photoelectron (XPS), FTIR and Raman spectroscopy and FESEM microscopy. Elemental composition was examined via energy dispersive spectroscopy (EDS). Humidity sensing properties were tested by measuring AC impedance in a climactic chamber at 25 °C and in the relative humidity range of 40–90%. Temperature sensing properties were tested by measuring DC resistance at 40% RH in the temperature range 40–90 °C. Synthesized powders were proven to be pure spinel Fd 3m phase with spherical, slightly agglomerated particles. Substitution of Mg with Ni results in structural changes such as a change in inversion parameter and particle agglomeration, which influences sensing properties of the material. Results show that the sensing properties of magnesium ferrite, which is already a well-established NTC sensor, can be improved by incorporating 10% of nickel in the spinel lattice structure. Mg0.9Ni0.1Fe2O4 exhibited higher temperature sensitivity and higher sensitivity towards humidity compared to MgFe2O4, while further substitution of Mg with Ni resulted in the decline of sensing properties, increase in particle size and agglomeration degree.",
publisher = "University of Novi Sad, Faculty of Technology, Novi Sad, Serbia",
journal = "CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, Programme and Book of Abstracts; October 11-14, 2023, Novi Sad, Serbia",
title = "Magnesium substitution with nickel and its influence on the sensing properties of MgFe2O4",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7269"
}

Dojčinović, M., Vasiljević, Z. Ž., Rakočević, L., Pavlović, V. P., Ammar-Merah, S., Vujančević, J.,& Nikolić, M. V.. (2023). Magnesium substitution with nickel and its influence on the sensing properties of MgFe2O4. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, Programme and Book of Abstracts; October 11-14, 2023, Novi Sad, Serbia
University of Novi Sad, Faculty of Technology, Novi Sad, Serbia..
https://hdl.handle.net/21.15107/rcub_machinery_7269

Dojčinović M, Vasiljević ZŽ, Rakočević L, Pavlović VP, Ammar-Merah S, Vujančević J, Nikolić MV. Magnesium substitution with nickel and its influence on the sensing properties of MgFe2O4. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, Programme and Book of Abstracts; October 11-14, 2023, Novi Sad, Serbia. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7269 .

Dojčinović, Milena, Vasiljević, Zorka Ž., Rakočević, Lazar, Pavlović, Vera P., Ammar-Merah, Souad, Vujančević, Jelena, Nikolić, Maria Vesna, "Magnesium substitution with nickel and its influence on the sensing properties of MgFe2O4" in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, Programme and Book of Abstracts; October 11-14, 2023, Novi Sad, Serbia (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7269 .

TY  - JOUR
AU  - Dojčinović, Milena 
AU  - Vasiljević, Zorka Ž.
AU  - Rakočević, Lazar
AU  - Pavlović, Vera P.
AU  - Ammar-Merah, Souad
AU  - Vujančević, Jelena 
AU  - Nikolić, Maria Vesna
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3982
AB  - Temperature- and humidity-sensing properties were evaluated of NixMg1-x spinel ferrites (0 ≤ x ≤ 1) synthesized by a sol-gel combustion method using citric acid as fuel and nitrate ions as oxidizing agents. After the exothermic reaction, amorphous powders were calcined at 700 °C followed by characterization with XRD, FTIR, XPS, EDS and Raman spectroscopy and FESEM microscopy. Synthesized powders were tested as humidity- and temperature-sensing materials in the form of thick films on interdigitated electrodes on alumina substrate in a climatic chamber. The physicochemical investigation of synthesized materials revealed a cubic spinel Fd3m phase, nanosized but agglomerated particles with a partially to completely inverse spinel structure with increasing Ni content. Ni0.1Mg0.9Fe2O4 showed the highest material constant (B30,90) value of 3747 K and temperature sensitivity (α) of −4.08%/K compared to pure magnesium ferrite (B30,90 value of 3426 K and α of −3.73%/K) and the highest average sensitivity towards humidity of 922 kΩ/%RH in the relative humidity (RH) range of 40–90% at the working temperature of 25 °C.
PB  - MDPI (Basel, Switzerland)
T2  - Chemosensors
T1  - Humidity and Temperature Sensing of Mixed Nickel–Magnesium Spinel Ferrites
IS  - 1
SP  - 34
VL  - 11
DO  - https://doi.org/10.3390/chemosensors11010034
ER  - 

@article{
author = "Dojčinović, Milena  and Vasiljević, Zorka Ž. and Rakočević, Lazar and Pavlović, Vera P. and Ammar-Merah, Souad and Vujančević, Jelena  and Nikolić, Maria Vesna",
year = "2023",
abstract = "Temperature- and humidity-sensing properties were evaluated of NixMg1-x spinel ferrites (0 ≤ x ≤ 1) synthesized by a sol-gel combustion method using citric acid as fuel and nitrate ions as oxidizing agents. After the exothermic reaction, amorphous powders were calcined at 700 °C followed by characterization with XRD, FTIR, XPS, EDS and Raman spectroscopy and FESEM microscopy. Synthesized powders were tested as humidity- and temperature-sensing materials in the form of thick films on interdigitated electrodes on alumina substrate in a climatic chamber. The physicochemical investigation of synthesized materials revealed a cubic spinel Fd3m phase, nanosized but agglomerated particles with a partially to completely inverse spinel structure with increasing Ni content. Ni0.1Mg0.9Fe2O4 showed the highest material constant (B30,90) value of 3747 K and temperature sensitivity (α) of −4.08%/K compared to pure magnesium ferrite (B30,90 value of 3426 K and α of −3.73%/K) and the highest average sensitivity towards humidity of 922 kΩ/%RH in the relative humidity (RH) range of 40–90% at the working temperature of 25 °C.",
publisher = "MDPI (Basel, Switzerland)",
journal = "Chemosensors",
title = "Humidity and Temperature Sensing of Mixed Nickel–Magnesium Spinel Ferrites",
number = "1",
pages = "34",
volume = "11",
doi = "https://doi.org/10.3390/chemosensors11010034"
}

Dojčinović, M., Vasiljević, Z. Ž., Rakočević, L., Pavlović, V. P., Ammar-Merah, S., Vujančević, J.,& Nikolić, M. V.. (2023). Humidity and Temperature Sensing of Mixed Nickel–Magnesium Spinel Ferrites. in Chemosensors
MDPI (Basel, Switzerland)., 11(1), 34.
https://doi.org/https://doi.org/10.3390/chemosensors11010034

Dojčinović M, Vasiljević ZŽ, Rakočević L, Pavlović VP, Ammar-Merah S, Vujančević J, Nikolić MV. Humidity and Temperature Sensing of Mixed Nickel–Magnesium Spinel Ferrites. in Chemosensors. 2023;11(1):34.
doi:https://doi.org/10.3390/chemosensors11010034 .

Dojčinović, Milena , Vasiljević, Zorka Ž., Rakočević, Lazar, Pavlović, Vera P., Ammar-Merah, Souad, Vujančević, Jelena , Nikolić, Maria Vesna, "Humidity and Temperature Sensing of Mixed Nickel–Magnesium Spinel Ferrites" in Chemosensors, 11, no. 1 (2023):34,
https://doi.org/https://doi.org/10.3390/chemosensors11010034 . .

TY  - CONF
AU  - Dojčinović, Milena 
AU  - Vasiljević, Zorka Ž.
AU  - Pavlović, Vera P.
AU  - Vujančević, Jelena
AU  - Tadić, Nenad
AU  - Nikolić, Maria Vesna
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4225
AB  - Problems that countries all over the world have in common are dependence of economy and energy production on fossil fuels. There is a growing need for energy production and storage routes that are safe for the environment, renewable, efficient and cheap. One of the directions in which science is moving forward is discovering materials suitable for use in batteries and supercapacitors to improve their operating potential, electrical capacity or biocompatibility. The objective is also to synthesize materials for batteries or supercapacitors that are cheap, consist of earth abundant elements and have high electrochemical activity.In this work, mixed nickel-magnesium ferrites NixMg1−xFe2O4, with x being 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1, were synthesized via sol-gel combustion synthesis with citric acid used as fuel and nitrate ions used as oxidizing agents. Combusted powders were calcined at 700 °C. The structure and morphology of the powders were characterized with X-ray diffraction method (XRD), field emission scanning electron microscopy (FESEM), Raman and FTIR spectroscopy. The band gap was calculated by using UV/Vis diffuse reflectance spectroscopy (DRS). Samples were cast on nickel foam and tested as energy storage materials in a three-electrode setup in 3 M KOH aqueous solution as electrolyte. The methods used were cyclic voltammetry (CV) and constant current chronopotentiometry to obtain galvanostatic charge-discharge (GCD) curves. Results show that all of the synthesized materials show battery-type charge storage in alkaline electrolyte due to the formation of metal cation oxyhydroxides. With increasing nickel content, electrochemical activity drops. The highest value of capacity, 34.3 mA h g-1 at the current density of 500 mA g-1 is ascribed to magnesium ferrite, MgFe2O4.
PB  - University of Belgrade, Faculty of Physical Chemistry, Belgrade, Serbia
C3  - COIN2022 - Contemporary Batteries and Supercapacitors - International Symposium Belgrade 2022 - Program and Book of Abstracts, June 1-2, 2022
T1  - Mixed Ni-Mg Spinel Ferrites Used as Materials for Charge Storage Electrodes
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4225
ER  - 

@conference{
author = "Dojčinović, Milena  and Vasiljević, Zorka Ž. and Pavlović, Vera P. and Vujančević, Jelena and Tadić, Nenad and Nikolić, Maria Vesna",
year = "2022",
abstract = "Problems that countries all over the world have in common are dependence of economy and energy production on fossil fuels. There is a growing need for energy production and storage routes that are safe for the environment, renewable, efficient and cheap. One of the directions in which science is moving forward is discovering materials suitable for use in batteries and supercapacitors to improve their operating potential, electrical capacity or biocompatibility. The objective is also to synthesize materials for batteries or supercapacitors that are cheap, consist of earth abundant elements and have high electrochemical activity.In this work, mixed nickel-magnesium ferrites NixMg1−xFe2O4, with x being 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1, were synthesized via sol-gel combustion synthesis with citric acid used as fuel and nitrate ions used as oxidizing agents. Combusted powders were calcined at 700 °C. The structure and morphology of the powders were characterized with X-ray diffraction method (XRD), field emission scanning electron microscopy (FESEM), Raman and FTIR spectroscopy. The band gap was calculated by using UV/Vis diffuse reflectance spectroscopy (DRS). Samples were cast on nickel foam and tested as energy storage materials in a three-electrode setup in 3 M KOH aqueous solution as electrolyte. The methods used were cyclic voltammetry (CV) and constant current chronopotentiometry to obtain galvanostatic charge-discharge (GCD) curves. Results show that all of the synthesized materials show battery-type charge storage in alkaline electrolyte due to the formation of metal cation oxyhydroxides. With increasing nickel content, electrochemical activity drops. The highest value of capacity, 34.3 mA h g-1 at the current density of 500 mA g-1 is ascribed to magnesium ferrite, MgFe2O4.",
publisher = "University of Belgrade, Faculty of Physical Chemistry, Belgrade, Serbia",
journal = "COIN2022 - Contemporary Batteries and Supercapacitors - International Symposium Belgrade 2022 - Program and Book of Abstracts, June 1-2, 2022",
title = "Mixed Ni-Mg Spinel Ferrites Used as Materials for Charge Storage Electrodes",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4225"
}

Dojčinović, M., Vasiljević, Z. Ž., Pavlović, V. P., Vujančević, J., Tadić, N.,& Nikolić, M. V.. (2022). Mixed Ni-Mg Spinel Ferrites Used as Materials for Charge Storage Electrodes. in COIN2022 - Contemporary Batteries and Supercapacitors - International Symposium Belgrade 2022 - Program and Book of Abstracts, June 1-2, 2022
University of Belgrade, Faculty of Physical Chemistry, Belgrade, Serbia..
https://hdl.handle.net/21.15107/rcub_machinery_4225

Dojčinović M, Vasiljević ZŽ, Pavlović VP, Vujančević J, Tadić N, Nikolić MV. Mixed Ni-Mg Spinel Ferrites Used as Materials for Charge Storage Electrodes. in COIN2022 - Contemporary Batteries and Supercapacitors - International Symposium Belgrade 2022 - Program and Book of Abstracts, June 1-2, 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_4225 .

Dojčinović, Milena , Vasiljević, Zorka Ž., Pavlović, Vera P., Vujančević, Jelena, Tadić, Nenad, Nikolić, Maria Vesna, "Mixed Ni-Mg Spinel Ferrites Used as Materials for Charge Storage Electrodes" in COIN2022 - Contemporary Batteries and Supercapacitors - International Symposium Belgrade 2022 - Program and Book of Abstracts, June 1-2, 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_4225 .

TY  - JOUR
AU  - Dojčinović, Milena 
AU  - Vasiljević, Zorka Ž.
AU  - Pavlović, Vera P.
AU  - Barišić, Dario
AU  - Pajić, Damir
AU  - Tadić, Nenad B.
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4068
AB  - CoxMg1-xFe2O4 (where x was 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spinel ferrites were synthesized by the sol-gel combustion method using citric acid as fuel, following the rules of propellant chemistry. Amorphous powders were then calcined at 700 degrees C for 3 h. Structural analysis by X-Ray diffraction (XRD), FTIR and Raman spectroscopy confirmed the formation of a cubic spinel structure where the cation distribution and inversion degree depended on the Co2+ and Mg2+ ion content. Accordingly, the lattice parameter varied between 8.3703 angstrom (MgFe2O4) and 8.3919 A (Co-0.9 Mg0.1Fe2O4) as did the crystallite size, from 34 nm (Co0.1Mg0.9Fe2O4) to 48 nm (Co0.9Mg0.1Fe2O4). Scanning electron microscopy (SEM) showed the formation of multigrain agglomerates. Determined values of the maximal and remanent magnetization, as well as coercive field, depended on the Co2+ and Mg2+ ion content and increased with substitution of diamagnetic Mg2+ ions with magnetic Co2+ ions. Most impressive is the increase of the coercive field from 74 Oe for MgFe2O4 to 1000 Oe for CoFe2O4, as well as an increase of magnetization in the field of 10 kOe from 27.4 emu g(-1) to 75.7 emu g(-1). The determined optical band gaps from UV/Vis DRS measurements showed a strong dependence on cation content, morphology, and crystallite size, decreasing from 2.09 eV for MgFe2O4 to 1.42 eV for CoFe2O4. The photocatalytic efficiency of as-synthesized ferrites was investigated by monitoring photocatalytic degradation of Methylene Blue (MB) under natural sunlight, and artificial light source emitting visible light. Different conditions of MB degradation such as photocatalyst loading, molar concentration of MB, and pH values were investigated. Results have shown that under both visible light and natural sunlight, excessive amounts of cobalt retarded the photocatalytic process. Co0.9Mg0.1Fe2O4 showed considerable activity (74.5% after 4 h) that is unexpected but possibly connected to structural anomalies. The best photocatalytic activity under natural sunlight was achieved by MgFe204 (82% after 4 h), while the best photocatalytic activity under visible light was achieved by Co0.1Mg0.9Fe2O4 (79% after 4 h).
PB  - Elsevier
T2  - Journal of Alloys and Compounds
T1  - Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties
IS  - 1
SP  - 157429
VL  - 855
DO  - 10.1016/j.jallcom.2020.157429
ER  - 

@article{
author = "Dojčinović, Milena  and Vasiljević, Zorka Ž. and Pavlović, Vera P. and Barišić, Dario and Pajić, Damir and Tadić, Nenad B. and Nikolić, Maria Vesna",
year = "2021",
abstract = "CoxMg1-xFe2O4 (where x was 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spinel ferrites were synthesized by the sol-gel combustion method using citric acid as fuel, following the rules of propellant chemistry. Amorphous powders were then calcined at 700 degrees C for 3 h. Structural analysis by X-Ray diffraction (XRD), FTIR and Raman spectroscopy confirmed the formation of a cubic spinel structure where the cation distribution and inversion degree depended on the Co2+ and Mg2+ ion content. Accordingly, the lattice parameter varied between 8.3703 angstrom (MgFe2O4) and 8.3919 A (Co-0.9 Mg0.1Fe2O4) as did the crystallite size, from 34 nm (Co0.1Mg0.9Fe2O4) to 48 nm (Co0.9Mg0.1Fe2O4). Scanning electron microscopy (SEM) showed the formation of multigrain agglomerates. Determined values of the maximal and remanent magnetization, as well as coercive field, depended on the Co2+ and Mg2+ ion content and increased with substitution of diamagnetic Mg2+ ions with magnetic Co2+ ions. Most impressive is the increase of the coercive field from 74 Oe for MgFe2O4 to 1000 Oe for CoFe2O4, as well as an increase of magnetization in the field of 10 kOe from 27.4 emu g(-1) to 75.7 emu g(-1). The determined optical band gaps from UV/Vis DRS measurements showed a strong dependence on cation content, morphology, and crystallite size, decreasing from 2.09 eV for MgFe2O4 to 1.42 eV for CoFe2O4. The photocatalytic efficiency of as-synthesized ferrites was investigated by monitoring photocatalytic degradation of Methylene Blue (MB) under natural sunlight, and artificial light source emitting visible light. Different conditions of MB degradation such as photocatalyst loading, molar concentration of MB, and pH values were investigated. Results have shown that under both visible light and natural sunlight, excessive amounts of cobalt retarded the photocatalytic process. Co0.9Mg0.1Fe2O4 showed considerable activity (74.5% after 4 h) that is unexpected but possibly connected to structural anomalies. The best photocatalytic activity under natural sunlight was achieved by MgFe204 (82% after 4 h), while the best photocatalytic activity under visible light was achieved by Co0.1Mg0.9Fe2O4 (79% after 4 h).",
publisher = "Elsevier",
journal = "Journal of Alloys and Compounds",
title = "Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties",
number = "1",
pages = "157429",
volume = "855",
doi = "10.1016/j.jallcom.2020.157429"
}

Dojčinović, M., Vasiljević, Z. Ž., Pavlović, V. P., Barišić, D., Pajić, D., Tadić, N. B.,& Nikolić, M. V.. (2021). Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties. in Journal of Alloys and Compounds
Elsevier., 855(1), 157429.
https://doi.org/10.1016/j.jallcom.2020.157429

Dojčinović M, Vasiljević ZŽ, Pavlović VP, Barišić D, Pajić D, Tadić NB, Nikolić MV. Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties. in Journal of Alloys and Compounds. 2021;855(1):157429.
doi:10.1016/j.jallcom.2020.157429 .

Dojčinović, Milena , Vasiljević, Zorka Ž., Pavlović, Vera P., Barišić, Dario, Pajić, Damir, Tadić, Nenad B., Nikolić, Maria Vesna, "Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties" in Journal of Alloys and Compounds, 855, no. 1 (2021):157429,
https://doi.org/10.1016/j.jallcom.2020.157429 . .

TY  - JOUR
AU  - Dojčinović, Milena 
AU  - Vasiljević, Zorka Ž.
AU  - Pavlović, Vera P.
AU  - Barišić, Dario
AU  - Pajić, Damir
AU  - Tadić, Nenad B.
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3604
AB  - CoxMg1-xFe2O4 (where x was 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spinel ferrites were synthesized by the sol-gel combustion method using citric acid as fuel, following the rules of propellant chemistry. Amorphous powders were then calcined at 700 degrees C for 3 h. Structural analysis by X-Ray diffraction (XRD), FTIR and Raman spectroscopy confirmed the formation of a cubic spinel structure where the cation distribution and inversion degree depended on the Co2+ and Mg2+ ion content. Accordingly, the lattice parameter varied between 8.3703 angstrom (MgFe2O4) and 8.3919 A (Co-0.9 Mg0.1Fe2O4) as did the crystallite size, from 34 nm (Co0.1Mg0.9Fe2O4) to 48 nm (Co0.9Mg0.1Fe2O4). Scanning electron microscopy (SEM) showed the formation of multigrain agglomerates. Determined values of the maximal and remanent magnetization, as well as coercive field, depended on the Co2+ and Mg2+ ion content and increased with substitution of diamagnetic Mg2+ ions with magnetic Co2+ ions. Most impressive is the increase of the coercive field from 74 Oe for MgFe2O4 to 1000 Oe for CoFe2O4, as well as an increase of magnetization in the field of 10 kOe from 27.4 emu g(-1) to 75.7 emu g(-1). The determined optical band gaps from UV/Vis DRS measurements showed a strong dependence on cation content, morphology, and crystallite size, decreasing from 2.09 eV for MgFe2O4 to 1.42 eV for CoFe2O4. The photocatalytic efficiency of as-synthesized ferrites was investigated by monitoring photocatalytic degradation of Methylene Blue (MB) under natural sunlight, and artificial light source emitting visible light. Different conditions of MB degradation such as photocatalyst loading, molar concentration of MB, and pH values were investigated. Results have shown that under both visible light and natural sunlight, excessive amounts of cobalt retarded the photocatalytic process. Co0.9Mg0.1Fe2O4 showed considerable activity (74.5% after 4 h) that is unexpected but possibly connected to structural anomalies. The best photocatalytic activity under natural sunlight was achieved by MgFe204 (82% after 4 h), while the best photocatalytic activity under visible light was achieved by Co0.1Mg0.9Fe2O4 (79% after 4 h).
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties
VL  - 855
DO  - 10.1016/j.jallcom.2020.157429
ER  - 

@article{
author = "Dojčinović, Milena  and Vasiljević, Zorka Ž. and Pavlović, Vera P. and Barišić, Dario and Pajić, Damir and Tadić, Nenad B. and Nikolić, Maria Vesna",
year = "2021",
abstract = "CoxMg1-xFe2O4 (where x was 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spinel ferrites were synthesized by the sol-gel combustion method using citric acid as fuel, following the rules of propellant chemistry. Amorphous powders were then calcined at 700 degrees C for 3 h. Structural analysis by X-Ray diffraction (XRD), FTIR and Raman spectroscopy confirmed the formation of a cubic spinel structure where the cation distribution and inversion degree depended on the Co2+ and Mg2+ ion content. Accordingly, the lattice parameter varied between 8.3703 angstrom (MgFe2O4) and 8.3919 A (Co-0.9 Mg0.1Fe2O4) as did the crystallite size, from 34 nm (Co0.1Mg0.9Fe2O4) to 48 nm (Co0.9Mg0.1Fe2O4). Scanning electron microscopy (SEM) showed the formation of multigrain agglomerates. Determined values of the maximal and remanent magnetization, as well as coercive field, depended on the Co2+ and Mg2+ ion content and increased with substitution of diamagnetic Mg2+ ions with magnetic Co2+ ions. Most impressive is the increase of the coercive field from 74 Oe for MgFe2O4 to 1000 Oe for CoFe2O4, as well as an increase of magnetization in the field of 10 kOe from 27.4 emu g(-1) to 75.7 emu g(-1). The determined optical band gaps from UV/Vis DRS measurements showed a strong dependence on cation content, morphology, and crystallite size, decreasing from 2.09 eV for MgFe2O4 to 1.42 eV for CoFe2O4. The photocatalytic efficiency of as-synthesized ferrites was investigated by monitoring photocatalytic degradation of Methylene Blue (MB) under natural sunlight, and artificial light source emitting visible light. Different conditions of MB degradation such as photocatalyst loading, molar concentration of MB, and pH values were investigated. Results have shown that under both visible light and natural sunlight, excessive amounts of cobalt retarded the photocatalytic process. Co0.9Mg0.1Fe2O4 showed considerable activity (74.5% after 4 h) that is unexpected but possibly connected to structural anomalies. The best photocatalytic activity under natural sunlight was achieved by MgFe204 (82% after 4 h), while the best photocatalytic activity under visible light was achieved by Co0.1Mg0.9Fe2O4 (79% after 4 h).",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties",
volume = "855",
doi = "10.1016/j.jallcom.2020.157429"
}

Dojčinović, M., Vasiljević, Z. Ž., Pavlović, V. P., Barišić, D., Pajić, D., Tadić, N. B.,& Nikolić, M. V.. (2021). Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 855.
https://doi.org/10.1016/j.jallcom.2020.157429

Dojčinović M, Vasiljević ZŽ, Pavlović VP, Barišić D, Pajić D, Tadić NB, Nikolić MV. Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties. in Journal of Alloys and Compounds. 2021;855.
doi:10.1016/j.jallcom.2020.157429 .

Dojčinović, Milena , Vasiljević, Zorka Ž., Pavlović, Vera P., Barišić, Dario, Pajić, Damir, Tadić, Nenad B., Nikolić, Maria Vesna, "Mixed Mg-Co spinel ferrites: Structure, morphology, magnetic and photocatalytic properties" in Journal of Alloys and Compounds, 855 (2021),
https://doi.org/10.1016/j.jallcom.2020.157429 . .

TY  - CONF
AU  - Vasiljević, Zorka Ž.
AU  - Dojčinović, Milena
AU  - Pavlović, Vera P.
AU  - Vujančević, Jelena
AU  - Tadić, Nenad
AU  - Nikolić, Maria Vesna
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6798
AB  - Nanocrystalline cobalt magnesium ferrites with varying cobalt and magnesium content (CoxMg1-xFe2O4, 0<x<1) were synthesized using the sol-gel self-combustion method with citric acid as fuel, followed by calcination at 700 °C for 2 hours. Structural characterization was performed using Xray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and Raman spectroscopy. It confirmed the formation of agglomerated nanocrystalline ferrites with an inverse cubic spinel structure. The optical band gap energy was determined using UV/Vis spectrophotometry. It reduced with increased Co content. Visible light photocatalytic activity was tested using natural and artificial light sources through a series of experimental degradations of the methylene blue (MB) solution.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019, Programme and The Book of Abstracts
T1  - Structure, morphology and photocatalytic properties of CoxMg1-xFe2O4 (0<x<1) spinel ferrites obtained by sol-gel synthesis
EP  - 126
SP  - 126
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6798
ER  - 

@conference{
author = "Vasiljević, Zorka Ž. and Dojčinović, Milena and Pavlović, Vera P. and Vujančević, Jelena and Tadić, Nenad and Nikolić, Maria Vesna",
year = "2019",
abstract = "Nanocrystalline cobalt magnesium ferrites with varying cobalt and magnesium content (CoxMg1-xFe2O4, 0<x<1) were synthesized using the sol-gel self-combustion method with citric acid as fuel, followed by calcination at 700 °C for 2 hours. Structural characterization was performed using Xray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and Raman spectroscopy. It confirmed the formation of agglomerated nanocrystalline ferrites with an inverse cubic spinel structure. The optical band gap energy was determined using UV/Vis spectrophotometry. It reduced with increased Co content. Visible light photocatalytic activity was tested using natural and artificial light sources through a series of experimental degradations of the methylene blue (MB) solution.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019, Programme and The Book of Abstracts",
title = "Structure, morphology and photocatalytic properties of CoxMg1-xFe2O4 (0<x<1) spinel ferrites obtained by sol-gel synthesis",
pages = "126-126",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6798"
}

Vasiljević, Z. Ž., Dojčinović, M., Pavlović, V. P., Vujančević, J., Tadić, N.,& Nikolić, M. V.. (2019). Structure, morphology and photocatalytic properties of CoxMg1-xFe2O4 (0<x<1) spinel ferrites obtained by sol-gel synthesis. in Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019, Programme and The Book of Abstracts
Belgrade : Materials Research Society of Serbia., 126-126.
https://hdl.handle.net/21.15107/rcub_machinery_6798

Vasiljević ZŽ, Dojčinović M, Pavlović VP, Vujančević J, Tadić N, Nikolić MV. Structure, morphology and photocatalytic properties of CoxMg1-xFe2O4 (0<x<1) spinel ferrites obtained by sol-gel synthesis. in Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019, Programme and The Book of Abstracts. 2019;:126-126.
https://hdl.handle.net/21.15107/rcub_machinery_6798 .

Vasiljević, Zorka Ž., Dojčinović, Milena, Pavlović, Vera P., Vujančević, Jelena, Tadić, Nenad, Nikolić, Maria Vesna, "Structure, morphology and photocatalytic properties of CoxMg1-xFe2O4 (0<x<1) spinel ferrites obtained by sol-gel synthesis" in Twenty-first Annual Conference YUCOMAT 2019 & Eleventh World Round Table Conference on Sintering WRTCS 2019, Herceg Novi, Montenegro, September 2-6, 2019, Programme and The Book of Abstracts (2019):126-126,
https://hdl.handle.net/21.15107/rcub_machinery_6798 .

TY  - CONF
AU  - Vasiljević, Zorka Ž.
AU  - Dojčinović, Milena
AU  - Pavlović, Vera P.
AU  - Vujančević, Jelena
AU  - Marković, Smilja
AU  - Tadić, Nenad
AU  - Nikolić, Maria Vesna
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6797
AB  - In this work, spinel magnesium cobalt ferrites (CoxMg1-xFe2O4, x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9) were synthesized by a sol-gel combustion method. Magnesium nitrate, cobalt nitrate and iron nitrate were used as oxidizers and citric acid was used as a reducing agent. The effects of cobalt ions on structural and morphological properties were investigated and characterized by X-ray diffraction (XRD), Raman spectroscopy, Field emission scanning electron microscope (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. A cubic spinel structure formed with a varied distribution of cobalt and magnesium ions on tetrahedral and octahedral sites that depended on their content. All ferrite powders consisted of multigrain agglomerates. Optical properties were investigated by UV- vis spectrophotometry. The photocatalytic activity of as prepared samples was evaluated by measuring the rate of photodegradation reaction of methylene blue (MB) under visible light irradiation. After 240 min, compared to other samples, the sample labeled as Co0.1Mg0.9Fe2O4 showed the best rate of photodecomposition of MB resulting in reduction of 90% of its initial concentration.
PB  - Institute for Multidisciplinary Research, University of Belgrade
C3  - 5th Conference of The Serbian Society for Ceramic Materials - 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, Programme and the Book of Abstracts
T1  - Influence of Co2+ ions on photocatalytic properties of MgFe2O4 ferrites
EP  - 73
SP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6797
ER  - 

@conference{
author = "Vasiljević, Zorka Ž. and Dojčinović, Milena and Pavlović, Vera P. and Vujančević, Jelena and Marković, Smilja and Tadić, Nenad and Nikolić, Maria Vesna",
year = "2019",
abstract = "In this work, spinel magnesium cobalt ferrites (CoxMg1-xFe2O4, x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9) were synthesized by a sol-gel combustion method. Magnesium nitrate, cobalt nitrate and iron nitrate were used as oxidizers and citric acid was used as a reducing agent. The effects of cobalt ions on structural and morphological properties were investigated and characterized by X-ray diffraction (XRD), Raman spectroscopy, Field emission scanning electron microscope (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. A cubic spinel structure formed with a varied distribution of cobalt and magnesium ions on tetrahedral and octahedral sites that depended on their content. All ferrite powders consisted of multigrain agglomerates. Optical properties were investigated by UV- vis spectrophotometry. The photocatalytic activity of as prepared samples was evaluated by measuring the rate of photodegradation reaction of methylene blue (MB) under visible light irradiation. After 240 min, compared to other samples, the sample labeled as Co0.1Mg0.9Fe2O4 showed the best rate of photodecomposition of MB resulting in reduction of 90% of its initial concentration.",
publisher = "Institute for Multidisciplinary Research, University of Belgrade",
journal = "5th Conference of The Serbian Society for Ceramic Materials - 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, Programme and the Book of Abstracts",
title = "Influence of Co2+ ions on photocatalytic properties of MgFe2O4 ferrites",
pages = "73-73",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6797"
}

Vasiljević, Z. Ž., Dojčinović, M., Pavlović, V. P., Vujančević, J., Marković, S., Tadić, N.,& Nikolić, M. V.. (2019). Influence of Co2+ ions on photocatalytic properties of MgFe2O4 ferrites. in 5th Conference of The Serbian Society for Ceramic Materials - 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, Programme and the Book of Abstracts
Institute for Multidisciplinary Research, University of Belgrade., 73-73.
https://hdl.handle.net/21.15107/rcub_machinery_6797

Vasiljević ZŽ, Dojčinović M, Pavlović VP, Vujančević J, Marković S, Tadić N, Nikolić MV. Influence of Co2+ ions on photocatalytic properties of MgFe2O4 ferrites. in 5th Conference of The Serbian Society for Ceramic Materials - 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, Programme and the Book of Abstracts. 2019;:73-73.
https://hdl.handle.net/21.15107/rcub_machinery_6797 .

Vasiljević, Zorka Ž., Dojčinović, Milena, Pavlović, Vera P., Vujančević, Jelena, Marković, Smilja, Tadić, Nenad, Nikolić, Maria Vesna, "Influence of Co2+ ions on photocatalytic properties of MgFe2O4 ferrites" in 5th Conference of The Serbian Society for Ceramic Materials - 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, Programme and the Book of Abstracts (2019):73-73,
https://hdl.handle.net/21.15107/rcub_machinery_6797 .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Vasiljević, Zorka Ž.
AU  - Luković, Miloljub D.
AU  - Pavlović, Vera P.
AU  - Krstić, Jugoslav B.
AU  - Vujančević, Jelena
AU  - Tadić, Nenad
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4066
AB  - Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of nanocrystalline zinc‐ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy (SEM) and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30‐90% in the frequency range 42 Hz – 1 MHz at room temperature (25 °C) and 50 °C. At 42 Hz at both analyzed temperatures the impedance reduced ~ 46 times in the humidity range 30‐90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.
PB  - Wiley
T2  - International Journal of Applied Ceramic Technology
T1  - Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing
EP  - 993
IS  - 3
SP  - 981
VL  - 16
DO  - 10.1111/ijac.13190
ER  - 

@article{
author = "Nikolić, Maria Vesna and Vasiljević, Zorka Ž. and Luković, Miloljub D. and Pavlović, Vera P. and Krstić, Jugoslav B. and Vujančević, Jelena and Tadić, Nenad and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2019",
abstract = "Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of nanocrystalline zinc‐ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy (SEM) and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30‐90% in the frequency range 42 Hz – 1 MHz at room temperature (25 °C) and 50 °C. At 42 Hz at both analyzed temperatures the impedance reduced ~ 46 times in the humidity range 30‐90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.",
publisher = "Wiley",
journal = "International Journal of Applied Ceramic Technology",
title = "Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing",
pages = "993-981",
number = "3",
volume = "16",
doi = "10.1111/ijac.13190"
}

Nikolić, M. V., Vasiljević, Z. Ž., Luković, M. D., Pavlović, V. P., Krstić, J. B., Vujančević, J., Tadić, N., Vlahović, B.,& Pavlović, V. B.. (2019). Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology
Wiley., 16(3), 981-993.
https://doi.org/10.1111/ijac.13190

Nikolić MV, Vasiljević ZŽ, Luković MD, Pavlović VP, Krstić JB, Vujančević J, Tadić N, Vlahović B, Pavlović VB. Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology. 2019;16(3):981-993.
doi:10.1111/ijac.13190 .

Nikolić, Maria Vesna, Vasiljević, Zorka Ž., Luković, Miloljub D., Pavlović, Vera P., Krstić, Jugoslav B., Vujančević, Jelena, Tadić, Nenad, Vlahović, Branislav, Pavlović, Vladimir B., "Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing" in International Journal of Applied Ceramic Technology, 16, no. 3 (2019):981-993,
https://doi.org/10.1111/ijac.13190 . .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Vasiljević, Zorka Ž.
AU  - Luković, Miloljub D.
AU  - Pavlović, Vera P.
AU  - Krstić, Jugoslav B.
AU  - Vujančević, Jelena
AU  - Tadić, Nenad
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3101
AB  - Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the formation of nanocrystalline zinc-ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30%-90% in the frequency range 42 Hz-1 MHz at room temperature (25 degrees C) and 50 degrees C. At 42 Hz at both analyzed temperatures the impedance reduced 46 times in the humidity range 30%-90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.
PB  - Wiley, Hoboken
T2  - International Journal of Applied Ceramic Technology
T1  - Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing
EP  - 993
IS  - 3
SP  - 981
VL  - 16
DO  - 10.1111/ijac.13190
ER  - 

@article{
author = "Nikolić, Maria Vesna and Vasiljević, Zorka Ž. and Luković, Miloljub D. and Pavlović, Vera P. and Krstić, Jugoslav B. and Vujančević, Jelena and Tadić, Nenad and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2019",
abstract = "Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the formation of nanocrystalline zinc-ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30%-90% in the frequency range 42 Hz-1 MHz at room temperature (25 degrees C) and 50 degrees C. At 42 Hz at both analyzed temperatures the impedance reduced 46 times in the humidity range 30%-90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.",
publisher = "Wiley, Hoboken",
journal = "International Journal of Applied Ceramic Technology",
title = "Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing",
pages = "993-981",
number = "3",
volume = "16",
doi = "10.1111/ijac.13190"
}

Nikolić, M. V., Vasiljević, Z. Ž., Luković, M. D., Pavlović, V. P., Krstić, J. B., Vujančević, J., Tadić, N., Vlahović, B.,& Pavlović, V. B.. (2019). Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology
Wiley, Hoboken., 16(3), 981-993.
https://doi.org/10.1111/ijac.13190

Nikolić MV, Vasiljević ZŽ, Luković MD, Pavlović VP, Krstić JB, Vujančević J, Tadić N, Vlahović B, Pavlović VB. Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology. 2019;16(3):981-993.
doi:10.1111/ijac.13190 .

Nikolić, Maria Vesna, Vasiljević, Zorka Ž., Luković, Miloljub D., Pavlović, Vera P., Krstić, Jugoslav B., Vujančević, Jelena, Tadić, Nenad, Vlahović, Branislav, Pavlović, Vladimir B., "Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing" in International Journal of Applied Ceramic Technology, 16, no. 3 (2019):981-993,
https://doi.org/10.1111/ijac.13190 . .

TY  - CONF
AU  - Dojčinović, Milena
AU  - Vasiljević, Zorka Ž.
AU  - Tadić, Nenad
AU  - Pavlović, Vera P.
AU  - Barišić, Dario
AU  - Pajić, Damir
AU  - Nikolić, Maria Vesna
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6799
AB  - Cobalt/magnesium ferrites with various mole percentage ratio of the metals (obtained structures are CoxMg1-xFe2O4 with x being 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) were synthesized by sol-gel combustion synthesis using glycine as fuel, following the rules of propellant chemistry. The powders were then sintered at 700 °C for 3 hours. Obtained powders were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, UV/vis diffuse reflectance spectroscopy (DRS). Investigation of the magnetic properties was also conducted by vibrating sample magnetometry (VSM). The obtained powders were proved to be phase-pure cubic spinels which formed agglomerated micrograins. Series of photocatalytic experiments of methylene blue degradation were done. The influence of different experimental conditions was investigated including variations of: pH values, concentrations of the pollutant, masses of the photocatalyst, different light sources and therefore different light irradiation. Interesting results, including enhancement of the degradation rate with the introduction of cobalt into MgFe2O4 and decrease of the degradation rate with further increase of cobalt content and formation of hard agglomerates, open new possibilities for further investigation of the utilisation of Co/Mg ferrites as photocatalysts.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Eighteenth Young Researchers' Conference - Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
T1  - Finding optimal conditions and investigating the structure & morphology of cobalt/magnesium ferrite based cubic spinels (CoxMg1-xFe2O4) as photocatalysts
EP  - 71
SP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6799
ER  - 

@conference{
author = "Dojčinović, Milena and Vasiljević, Zorka Ž. and Tadić, Nenad and Pavlović, Vera P. and Barišić, Dario and Pajić, Damir and Nikolić, Maria Vesna",
year = "2019",
abstract = "Cobalt/magnesium ferrites with various mole percentage ratio of the metals (obtained structures are CoxMg1-xFe2O4 with x being 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0) were synthesized by sol-gel combustion synthesis using glycine as fuel, following the rules of propellant chemistry. The powders were then sintered at 700 °C for 3 hours. Obtained powders were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, UV/vis diffuse reflectance spectroscopy (DRS). Investigation of the magnetic properties was also conducted by vibrating sample magnetometry (VSM). The obtained powders were proved to be phase-pure cubic spinels which formed agglomerated micrograins. Series of photocatalytic experiments of methylene blue degradation were done. The influence of different experimental conditions was investigated including variations of: pH values, concentrations of the pollutant, masses of the photocatalyst, different light sources and therefore different light irradiation. Interesting results, including enhancement of the degradation rate with the introduction of cobalt into MgFe2O4 and decrease of the degradation rate with further increase of cobalt content and formation of hard agglomerates, open new possibilities for further investigation of the utilisation of Co/Mg ferrites as photocatalysts.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Eighteenth Young Researchers' Conference - Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia",
title = "Finding optimal conditions and investigating the structure & morphology of cobalt/magnesium ferrite based cubic spinels (CoxMg1-xFe2O4) as photocatalysts",
pages = "71-71",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6799"
}

Dojčinović, M., Vasiljević, Z. Ž., Tadić, N., Pavlović, V. P., Barišić, D., Pajić, D.,& Nikolić, M. V.. (2019). Finding optimal conditions and investigating the structure & morphology of cobalt/magnesium ferrite based cubic spinels (CoxMg1-xFe2O4) as photocatalysts. in Program and the Book of Abstracts / Eighteenth Young Researchers' Conference - Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 71-71.
https://hdl.handle.net/21.15107/rcub_machinery_6799

Dojčinović M, Vasiljević ZŽ, Tadić N, Pavlović VP, Barišić D, Pajić D, Nikolić MV. Finding optimal conditions and investigating the structure & morphology of cobalt/magnesium ferrite based cubic spinels (CoxMg1-xFe2O4) as photocatalysts. in Program and the Book of Abstracts / Eighteenth Young Researchers' Conference - Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia. 2019;:71-71.
https://hdl.handle.net/21.15107/rcub_machinery_6799 .

Dojčinović, Milena, Vasiljević, Zorka Ž., Tadić, Nenad, Pavlović, Vera P., Barišić, Dario, Pajić, Damir, Nikolić, Maria Vesna, "Finding optimal conditions and investigating the structure & morphology of cobalt/magnesium ferrite based cubic spinels (CoxMg1-xFe2O4) as photocatalysts" in Program and the Book of Abstracts / Eighteenth Young Researchers' Conference - Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia (2019):71-71,
https://hdl.handle.net/21.15107/rcub_machinery_6799 .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Vasiljević, Zorka Ž.
AU  - Luković, Miloljub D.
AU  - Pavlović, Vera P.
AU  - Vujančević, Jelena
AU  - Radovanović, Milan
AU  - Krstić, Jugoslav B.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3945
AB  - Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.
PB  - Elsevier Science Sa, Lausanne
T2  - Sensors and Actuators B-Chemical
T1  - Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films
EP  - 664
SP  - 654
VL  - 277
DO  - 10.1016/j.snb.2018.09.063
ER  - 

@article{
author = "Nikolić, Maria Vesna and Vasiljević, Zorka Ž. and Luković, Miloljub D. and Pavlović, Vera P. and Vujančević, Jelena and Radovanović, Milan and Krstić, Jugoslav B. and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2018",
abstract = "Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Sensors and Actuators B-Chemical",
title = "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films",
pages = "664-654",
volume = "277",
doi = "10.1016/j.snb.2018.09.063"
}

Nikolić, M. V., Vasiljević, Z. Ž., Luković, M. D., Pavlović, V. P., Vujančević, J., Radovanović, M., Krstić, J. B., Vlahović, B.,& Pavlović, V. B.. (2018). Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical
Elsevier Science Sa, Lausanne., 277, 654-664.
https://doi.org/10.1016/j.snb.2018.09.063

Nikolić MV, Vasiljević ZŽ, Luković MD, Pavlović VP, Vujančević J, Radovanović M, Krstić JB, Vlahović B, Pavlović VB. Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical. 2018;277:654-664.
doi:10.1016/j.snb.2018.09.063 .

Nikolić, Maria Vesna, Vasiljević, Zorka Ž., Luković, Miloljub D., Pavlović, Vera P., Vujančević, Jelena, Radovanović, Milan, Krstić, Jugoslav B., Vlahović, Branislav, Pavlović, Vladimir B., "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films" in Sensors and Actuators B-Chemical, 277 (2018):654-664,
https://doi.org/10.1016/j.snb.2018.09.063 . .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Vasiljević, Zorka Ž.
AU  - Luković, Miloljub D.
AU  - Pavlović, Vera P.
AU  - Vujančević, Jelena
AU  - Radovanović, Milan
AU  - Krstić, Jugoslav B.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2887
AB  - Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.
PB  - Elsevier Science Sa, Lausanne
T2  - Sensors and Actuators B-Chemical
T1  - Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films
EP  - 664
SP  - 654
VL  - 277
DO  - 10.1016/j.snb.2018.09.063
ER  - 

@article{
author = "Nikolić, Maria Vesna and Vasiljević, Zorka Ž. and Luković, Miloljub D. and Pavlović, Vera P. and Vujančević, Jelena and Radovanović, Milan and Krstić, Jugoslav B. and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2018",
abstract = "Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Sensors and Actuators B-Chemical",
title = "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films",
pages = "664-654",
volume = "277",
doi = "10.1016/j.snb.2018.09.063"
}

Nikolić, M. V., Vasiljević, Z. Ž., Luković, M. D., Pavlović, V. P., Vujančević, J., Radovanović, M., Krstić, J. B., Vlahović, B.,& Pavlović, V. B.. (2018). Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical
Elsevier Science Sa, Lausanne., 277, 654-664.
https://doi.org/10.1016/j.snb.2018.09.063

Nikolić MV, Vasiljević ZŽ, Luković MD, Pavlović VP, Vujančević J, Radovanović M, Krstić JB, Vlahović B, Pavlović VB. Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical. 2018;277:654-664.
doi:10.1016/j.snb.2018.09.063 .

Nikolić, Maria Vesna, Vasiljević, Zorka Ž., Luković, Miloljub D., Pavlović, Vera P., Vujančević, Jelena, Radovanović, Milan, Krstić, Jugoslav B., Vlahović, Branislav, Pavlović, Vladimir B., "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films" in Sensors and Actuators B-Chemical, 277 (2018):654-664,
https://doi.org/10.1016/j.snb.2018.09.063 . .