TY  - JOUR
AU  - Lazarević, Zorica
AU  - Milutinović, Aleksandra
AU  - Anđelković, Ljubica
AU  - Petrović, Milica
AU  - Hadžić, Branka
AU  - Romčević, Maja
AU  - Trajić, Jelena
AU  - Romčević, Nebojša
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7658
AB  - Single phase cobalt ferrite (CoFe2O4) with nanoparticles of similar sizes (15.7-19 nm) was obtained by different synthesis methods: coprecipitation, ultrasonically assisted coprecipitation, coprecipitation followed by mechanochemical treatment, microemulsion and microwave assisted hydrothermal synthesis. The obtained CoFe2O4 samples have been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. Different methods of synthesis produced nanoparticles with different lattice constants, internal stresses and different cation inversion values. This is confirmed in the subtle changes in the Raman and IR spectra of different CoFe2O4 nano-powders. The Raman spectra of CoFe2O4 were compared with the spectra of other ferrites and some cubic oxide spinels in an attempt to evaluate the contribution of tetrahedral and octahedral oscillations in certain Raman modes.
AB  - Монофазни кобалт ферит са наночестицама сличних величина (15,7-19 нанометара) добијен је различитим методама синтезе: копреципитацијом, ултразвучно потпомогнутом копреципитацијом, копреципитацијом праћеном механохемијском синтезом, микроемулзијом и микроталасном хидротермалном синтезом. Добијени узорци кобалт ферита су проучавани коришћењем различитих техника карактеризације: дифракцијом рендгенских зрака на праху, Раман спектроскопијом, рефлексијом у далекој инфра-црвеној области (ИЦ) и методом апсорпције при вишеструкој тоталној рефлексији у комбинацији са инфра-црвеном спектроскопијом (АТР-ИЦ) у средњој инфра црвеној области. Различитим методама синтезе добијене су наночестице са различитим константама решетке, унутрашњим напрезањима и различитим вредностима инверзије катјона. Ово је потврђено у суптилним променама у Раман и ИЦ спектрима различитих нано-прахова кобалт ферита. Раман спектри кобалт ферита упоређени су са спектрима других ферита и неких кубних оксидних спинела у покушају да се процени утицај удела тетраедарских и октаедарских осцилација у одређеним Раман модовима.
PB  - Association for ETRAN Society
T2  - Science of Sintering
T1  - Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels
T1  - Kарактеризација наночестица кобалт ферита добијених различитим методама синтезе и поређење са Рамановим спектрима других ферита и неких кубичних оксидних спинела
VL  - 56
SP  - 171
EP  - 200
DO  - 10.2298/SOS230322035L
ER  - 

@article{
author = "Lazarević, Zorica and Milutinović, Aleksandra and Anđelković, Ljubica and Petrović, Milica and Hadžić, Branka and Romčević, Maja and Trajić, Jelena and Romčević, Nebojša",
year = "2024",
abstract = "Single phase cobalt ferrite (CoFe2O4) with nanoparticles of similar sizes (15.7-19 nm) was obtained by different synthesis methods: coprecipitation, ultrasonically assisted coprecipitation, coprecipitation followed by mechanochemical treatment, microemulsion and microwave assisted hydrothermal synthesis. The obtained CoFe2O4 samples have been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. Different methods of synthesis produced nanoparticles with different lattice constants, internal stresses and different cation inversion values. This is confirmed in the subtle changes in the Raman and IR spectra of different CoFe2O4 nano-powders. The Raman spectra of CoFe2O4 were compared with the spectra of other ferrites and some cubic oxide spinels in an attempt to evaluate the contribution of tetrahedral and octahedral oscillations in certain Raman modes., Монофазни кобалт ферит са наночестицама сличних величина (15,7-19 нанометара) добијен је различитим методама синтезе: копреципитацијом, ултразвучно потпомогнутом копреципитацијом, копреципитацијом праћеном механохемијском синтезом, микроемулзијом и микроталасном хидротермалном синтезом. Добијени узорци кобалт ферита су проучавани коришћењем различитих техника карактеризације: дифракцијом рендгенских зрака на праху, Раман спектроскопијом, рефлексијом у далекој инфра-црвеној области (ИЦ) и методом апсорпције при вишеструкој тоталној рефлексији у комбинацији са инфра-црвеном спектроскопијом (АТР-ИЦ) у средњој инфра црвеној области. Различитим методама синтезе добијене су наночестице са различитим константама решетке, унутрашњим напрезањима и различитим вредностима инверзије катјона. Ово је потврђено у суптилним променама у Раман и ИЦ спектрима различитих нано-прахова кобалт ферита. Раман спектри кобалт ферита упоређени су са спектрима других ферита и неких кубних оксидних спинела у покушају да се процени утицај удела тетраедарских и октаедарских осцилација у одређеним Раман модовима.",
publisher = "Association for ETRAN Society",
journal = "Science of Sintering",
title = "Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels, Kарактеризација наночестица кобалт ферита добијених различитим методама синтезе и поређење са Рамановим спектрима других ферита и неких кубичних оксидних спинела",
volume = "56",
pages = "171-200",
doi = "10.2298/SOS230322035L"
}

Lazarević, Z., Milutinović, A., Anđelković, L., Petrović, M., Hadžić, B., Romčević, M., Trajić, J.,& Romčević, N.. (2024). Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels. in Science of Sintering
Association for ETRAN Society., 56, 171-200.
https://doi.org/10.2298/SOS230322035L

Lazarević Z, Milutinović A, Anđelković L, Petrović M, Hadžić B, Romčević M, Trajić J, Romčević N. Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels. in Science of Sintering. 2024;56:171-200.
doi:10.2298/SOS230322035L .

Lazarević, Zorica, Milutinović, Aleksandra, Anđelković, Ljubica, Petrović, Milica, Hadžić, Branka, Romčević, Maja, Trajić, Jelena, Romčević, Nebojša, "Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels" in Science of Sintering, 56 (2024):171-200,
https://doi.org/10.2298/SOS230322035L . .

TY  - JOUR
AU  - Lazarević, Zorica
AU  - Milutinović, Aleksandra
AU  - Umićević, Ana
AU  - Ivanovski, Valentin
AU  - Koteski, Vasil
AU  - Anđelković, Ljubica
AU  - Romčević, Nebojša
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7659
AB  - The powdery cobalt ferrite (CoFe2O4) is prepared by coprecipitation followed by mechanochemical synthesis in a planetary ball mill. Obtained nanomaterial has been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. The investigated CoFe2O4 nanomaterial showed a typical XRD pattern of cubic spinel. In the Raman and IR spectra are observed all of first-order Raman and IR active modes. Weak sub-bands activated by structure disorder are seen also. Since nano-CoFe2O4 is macroscopically cubic, its main Raman and IR modes are assigned as in normal cubic spinel. Raman spectrum is fitted with 8 Lorentzian peaks. It is observed that the value of x 0.58 obtained from Raman spectrum, is in good agreement with the value obtained by XRD-structural analysis (0.51). To analyze the IR spectra, we used Decoupled Plasmon - Phonon (DPP) model of the complex dielectric function. Measurement of magnetization in the range of magnetic fields H>>Hc enable the calculation of the anisotropy coefficient K1 = 4.02·105 J cm-3, which is very high in cobalt ferrite. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was measured at room temperature in ± 12 mm s-1 Doppler velocity range. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was fitted with the extended Voigt-based fitting method.
PB  - INOE, Romania
T2  - Optoelectronics and Advanced Materials – Rapid Communications
T1  - Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment
VL  - 18
IS  - 5-6
SP  - 289
EP  - 295
ER  - 

@article{
author = "Lazarević, Zorica and Milutinović, Aleksandra and Umićević, Ana and Ivanovski, Valentin and Koteski, Vasil and Anđelković, Ljubica and Romčević, Nebojša",
year = "2024",
abstract = "The powdery cobalt ferrite (CoFe2O4) is prepared by coprecipitation followed by mechanochemical synthesis in a planetary ball mill. Obtained nanomaterial has been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. The investigated CoFe2O4 nanomaterial showed a typical XRD pattern of cubic spinel. In the Raman and IR spectra are observed all of first-order Raman and IR active modes. Weak sub-bands activated by structure disorder are seen also. Since nano-CoFe2O4 is macroscopically cubic, its main Raman and IR modes are assigned as in normal cubic spinel. Raman spectrum is fitted with 8 Lorentzian peaks. It is observed that the value of x 0.58 obtained from Raman spectrum, is in good agreement with the value obtained by XRD-structural analysis (0.51). To analyze the IR spectra, we used Decoupled Plasmon - Phonon (DPP) model of the complex dielectric function. Measurement of magnetization in the range of magnetic fields H>>Hc enable the calculation of the anisotropy coefficient K1 = 4.02·105 J cm-3, which is very high in cobalt ferrite. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was measured at room temperature in ± 12 mm s-1 Doppler velocity range. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was fitted with the extended Voigt-based fitting method.",
publisher = "INOE, Romania",
journal = "Optoelectronics and Advanced Materials – Rapid Communications",
title = "Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment",
volume = "18",
number = "5-6",
pages = "289-295"
}

Lazarević, Z., Milutinović, A., Umićević, A., Ivanovski, V., Koteski, V., Anđelković, L.,& Romčević, N.. (2024). Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment. in Optoelectronics and Advanced Materials – Rapid Communications
INOE, Romania., 18(5-6), 289-295.

Lazarević Z, Milutinović A, Umićević A, Ivanovski V, Koteski V, Anđelković L, Romčević N. Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment. in Optoelectronics and Advanced Materials – Rapid Communications. 2024;18(5-6):289-295..

Lazarević, Zorica, Milutinović, Aleksandra, Umićević, Ana, Ivanovski, Valentin, Koteski, Vasil, Anđelković, Ljubica, Romčević, Nebojša, "Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment" in Optoelectronics and Advanced Materials – Rapid Communications, 18, no. 5-6 (2024):289-295.

TY  - JOUR
AU  - Lazarević, Zorica
AU  - Anđelković, Ljubica
AU  - Šuljagić, Marija
AU  - Milutinović, Aleksandra
AU  - Ćurčić, Milica
AU  - Trajić, Jelena
AU  - Paunović, Novica
AU  - Romčević, Maja
AU  - Hadžić, Branka
AU  - Romčević, Nebojša
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6231
AB  - Nanocrystalline CoFe2O4 has been synthesized by various synthesis methods. The obtained monodomain nanoparticles are similar in sizes (15.8-19 nm), but with different internal stresses, size distributions and cation inversion coefficients (0.51 - 0.90) due to different synthesis routes. The structure and cation distribution are investigated by XRD diffraction analysis, Raman and FIR spectroscopy. Measurement of magnetization, i.e. coercivity, enable the calculation of the anisotropy coefficient K1 = (3.6-5.12)·105 J cm-3, which is very high in cobalt ferrite. The anisotropy coefficient directly depends on the nanoparticle size. It has been shown that magnetization linearly depends on the cation inversion, except in the sample with the largest nanoparticles (19 nm), where the more regular crystal structure prevails and higher values of magnetization were obtained. The average magnetic moments at 300 K are: μFe = 3.6μB and μCo = 2.5μB. It is obvious that with small adjustments in the synthesis, desirable nanoparticle properties can be obtained.
PB  - INOE, Romania
T2  - Optoelectronics and Advanced Materials – Rapid Communications
T1  - Vibrational and magnetic properties of nano-sized CoFe2O4 obtained by various synthesis techniques: a comparative study
VL  - 17
IS  - 5-6
SP  - 247
EP  - 254
UR  - https://hdl.handle.net/21.15107/rcub_cer_6231
ER  - 

@article{
author = "Lazarević, Zorica and Anđelković, Ljubica and Šuljagić, Marija and Milutinović, Aleksandra and Ćurčić, Milica and Trajić, Jelena and Paunović, Novica and Romčević, Maja and Hadžić, Branka and Romčević, Nebojša",
year = "2023",
abstract = "Nanocrystalline CoFe2O4 has been synthesized by various synthesis methods. The obtained monodomain nanoparticles are similar in sizes (15.8-19 nm), but with different internal stresses, size distributions and cation inversion coefficients (0.51 - 0.90) due to different synthesis routes. The structure and cation distribution are investigated by XRD diffraction analysis, Raman and FIR spectroscopy. Measurement of magnetization, i.e. coercivity, enable the calculation of the anisotropy coefficient K1 = (3.6-5.12)·105 J cm-3, which is very high in cobalt ferrite. The anisotropy coefficient directly depends on the nanoparticle size. It has been shown that magnetization linearly depends on the cation inversion, except in the sample with the largest nanoparticles (19 nm), where the more regular crystal structure prevails and higher values of magnetization were obtained. The average magnetic moments at 300 K are: μFe = 3.6μB and μCo = 2.5μB. It is obvious that with small adjustments in the synthesis, desirable nanoparticle properties can be obtained.",
publisher = "INOE, Romania",
journal = "Optoelectronics and Advanced Materials – Rapid Communications",
title = "Vibrational and magnetic properties of nano-sized CoFe2O4 obtained by various synthesis techniques: a comparative study",
volume = "17",
number = "5-6",
pages = "247-254",
url = "https://hdl.handle.net/21.15107/rcub_cer_6231"
}

Lazarević, Z., Anđelković, L., Šuljagić, M., Milutinović, A., Ćurčić, M., Trajić, J., Paunović, N., Romčević, M., Hadžić, B.,& Romčević, N.. (2023). Vibrational and magnetic properties of nano-sized CoFe2O4 obtained by various synthesis techniques: a comparative study. in Optoelectronics and Advanced Materials – Rapid Communications
INOE, Romania., 17(5-6), 247-254.
https://hdl.handle.net/21.15107/rcub_cer_6231

Lazarević Z, Anđelković L, Šuljagić M, Milutinović A, Ćurčić M, Trajić J, Paunović N, Romčević M, Hadžić B, Romčević N. Vibrational and magnetic properties of nano-sized CoFe2O4 obtained by various synthesis techniques: a comparative study. in Optoelectronics and Advanced Materials – Rapid Communications. 2023;17(5-6):247-254.
https://hdl.handle.net/21.15107/rcub_cer_6231 .

Lazarević, Zorica, Anđelković, Ljubica, Šuljagić, Marija, Milutinović, Aleksandra, Ćurčić, Milica, Trajić, Jelena, Paunović, Novica, Romčević, Maja, Hadžić, Branka, Romčević, Nebojša, "Vibrational and magnetic properties of nano-sized CoFe2O4 obtained by various synthesis techniques: a comparative study" in Optoelectronics and Advanced Materials – Rapid Communications, 17, no. 5-6 (2023):247-254,
https://hdl.handle.net/21.15107/rcub_cer_6231 .

TY  - JOUR
AU  - Lazarević, Zorica
AU  - Milutinović, Aleksandra
AU  - Anđelković, Ljubica
AU  - Petrović, Milica
AU  - Hadžić, Branka
AU  - Romčević, Maja
AU  - Trajić, Jelena
AU  - Romčević, Nebojša
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7212
AB  - ingle phase cobalt ferrite (CoFe2O4) with nanoparticles of similar sizes (15.7-19 nm) was obtained by different synthesis methods: coprecipitation, ultrasonically assisted coprecipitation, coprecipitation followed by mechanochemical treatment, microemulsion and microwave assisted hydrothermal synthesis. The obtained CoFe2O4 samples have been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. Different methods of synthesis produced nanoparticles with different lattice constants, internal stresses and different cation inversion values. This is confirmed in the subtle changes in the Raman and IR spectra of different CoFe2O4 nano-powders. The Raman spectra of CoFe2O4 were compared with the spectra of other ferrites and some cubic oxide spinels in an attempt to evaluate the contribution of tetrahedral and octahedral oscillations in certain Raman modes.
AB  - Монофазни кобалт ферит са наночестицама сличних величина (15,7-19  нанометара) добијен је различитим методама синтезе: копреципитацијом,  ултразвучно потпомогнутом копреципитацијом, копреципитацијом праћеном  механохемијском синтезом, микроемулзијом и микроталасном хидротермалном  синтезом. Добијени узорци кобалт ферита су проучавани коришћењем различитих  техника карактеризације: дифракцијом рендгенских зрака на праху, Раман спектроскопијом, рефлексијом у далекој инфра-црвеној области (ИЦ) и методом  апсорпције при вишеструкој тоталној рефлексији у комбинацији са инфра-црвеном  спектроскопијом (АТР-ИЦ) у средњој инфра црвеној области. Различитим методама  синтезе добијене су наночестице са различитим константама решетке, унутрашњим  напрезањима и различитим вредностима инверзије катјона. Ово је потврђено у  суптилним променама у Раман и ИЦ спектрима различитих нано-прахова кобалт  ферита. Раман спектри кобалт ферита упоређени су са спектрима других ферита и  неких кубних оксидних спинела у покушају да се процени утицај удела  тетраедарских и октаедарских осцилација у одређеним Раман модовима.
PB  - Association for ETRAN Society
T2  - Science of Sintering
T1  - Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels
T1  - Kарактеризација наночестица кобалт ферита добијених  различитим методама синтезе и поређење са Рамановим спектрима  других ферита и неких кубичних оксидних спинела
DO  - 10.2298/SOS230322035L
ER  - 

@article{
author = "Lazarević, Zorica and Milutinović, Aleksandra and Anđelković, Ljubica and Petrović, Milica and Hadžić, Branka and Romčević, Maja and Trajić, Jelena and Romčević, Nebojša",
year = "2023",
abstract = "ingle phase cobalt ferrite (CoFe2O4) with nanoparticles of similar sizes (15.7-19 nm) was obtained by different synthesis methods: coprecipitation, ultrasonically assisted coprecipitation, coprecipitation followed by mechanochemical treatment, microemulsion and microwave assisted hydrothermal synthesis. The obtained CoFe2O4 samples have been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fourier-transform infrared (FTIR) spectroscopy in mid IR spectra. Different methods of synthesis produced nanoparticles with different lattice constants, internal stresses and different cation inversion values. This is confirmed in the subtle changes in the Raman and IR spectra of different CoFe2O4 nano-powders. The Raman spectra of CoFe2O4 were compared with the spectra of other ferrites and some cubic oxide spinels in an attempt to evaluate the contribution of tetrahedral and octahedral oscillations in certain Raman modes., Монофазни кобалт ферит са наночестицама сличних величина (15,7-19  нанометара) добијен је различитим методама синтезе: копреципитацијом,  ултразвучно потпомогнутом копреципитацијом, копреципитацијом праћеном  механохемијском синтезом, микроемулзијом и микроталасном хидротермалном  синтезом. Добијени узорци кобалт ферита су проучавани коришћењем различитих  техника карактеризације: дифракцијом рендгенских зрака на праху, Раман спектроскопијом, рефлексијом у далекој инфра-црвеној области (ИЦ) и методом  апсорпције при вишеструкој тоталној рефлексији у комбинацији са инфра-црвеном  спектроскопијом (АТР-ИЦ) у средњој инфра црвеној области. Различитим методама  синтезе добијене су наночестице са различитим константама решетке, унутрашњим  напрезањима и различитим вредностима инверзије катјона. Ово је потврђено у  суптилним променама у Раман и ИЦ спектрима различитих нано-прахова кобалт  ферита. Раман спектри кобалт ферита упоређени су са спектрима других ферита и  неких кубних оксидних спинела у покушају да се процени утицај удела  тетраедарских и октаедарских осцилација у одређеним Раман модовима.",
publisher = "Association for ETRAN Society",
journal = "Science of Sintering",
title = "Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels, Kарактеризација наночестица кобалт ферита добијених  различитим методама синтезе и поређење са Рамановим спектрима  других ферита и неких кубичних оксидних спинела",
doi = "10.2298/SOS230322035L"
}

Lazarević, Z., Milutinović, A., Anđelković, L., Petrović, M., Hadžić, B., Romčević, M., Trajić, J.,& Romčević, N.. (2023). Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels. in Science of Sintering
Association for ETRAN Society..
https://doi.org/10.2298/SOS230322035L

Lazarević Z, Milutinović A, Anđelković L, Petrović M, Hadžić B, Romčević M, Trajić J, Romčević N. Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels. in Science of Sintering. 2023;.
doi:10.2298/SOS230322035L .

Lazarević, Zorica, Milutinović, Aleksandra, Anđelković, Ljubica, Petrović, Milica, Hadžić, Branka, Romčević, Maja, Trajić, Jelena, Romčević, Nebojša, "Characterization of cobalt ferrite nanoparticles obtained by various synthesis methods and comparison with the Raman spectra of other ferrites and some cubic oxide spinels" in Science of Sintering (2023),
https://doi.org/10.2298/SOS230322035L . .