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 . .

TY  - JOUR
AU  - Todorović-Marković, Biljana
AU  - Draganić, Ilija N.
AU  - Vasiljević-Radović, Dana
AU  - Romčević, Nebojša
AU  - Romčević, Maja
AU  - Dramićanin, Miroslav D.
AU  - Marković, Zoran
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7483
AB  - In this paper, results of structural modification of fullerene thin films by single and multiple charged boron ions (B+, B3+) are presented. The applied ion energies were in the range of 15–45 keV. The characterization of as-deposited and irradiated specimens has been performed by atomic force microscopy, Raman and Fourier transform infrared spectroscopy and UV/vis spectrophotometry. The results of Raman analysis have shown the formation of amorphous layer after irradiation of fullerene thin films. Fourier transform infrared spectroscopy has confirmed the formation of new B–C bonds in irradiated films at higher fluences (2 × 1016 cm−2). The morphology of bombarded films has been changed significantly. The optical band gap was found to be reduced from 1.7 to 1.06 eV for irradiated films by B3+ ions and 0.7 eV for irradiated films by B+ ions.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films
VL  - 253
IS  - 8
SP  - 4029
EP  - 4035
DO  - 10.1016/j.apsusc.2006.08.035
ER  - 

@article{
author = "Todorović-Marković, Biljana and Draganić, Ilija N. and Vasiljević-Radović, Dana and Romčević, Nebojša and Romčević, Maja and Dramićanin, Miroslav D. and Marković, Zoran",
year = "2007",
abstract = "In this paper, results of structural modification of fullerene thin films by single and multiple charged boron ions (B+, B3+) are presented. The applied ion energies were in the range of 15–45 keV. The characterization of as-deposited and irradiated specimens has been performed by atomic force microscopy, Raman and Fourier transform infrared spectroscopy and UV/vis spectrophotometry. The results of Raman analysis have shown the formation of amorphous layer after irradiation of fullerene thin films. Fourier transform infrared spectroscopy has confirmed the formation of new B–C bonds in irradiated films at higher fluences (2 × 1016 cm−2). The morphology of bombarded films has been changed significantly. The optical band gap was found to be reduced from 1.7 to 1.06 eV for irradiated films by B3+ ions and 0.7 eV for irradiated films by B+ ions.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films",
volume = "253",
number = "8",
pages = "4029-4035",
doi = "10.1016/j.apsusc.2006.08.035"
}

Todorović-Marković, B., Draganić, I. N., Vasiljević-Radović, D., Romčević, N., Romčević, M., Dramićanin, M. D.,& Marković, Z.. (2007). Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films. in Applied Surface Science
Elsevier., 253(8), 4029-4035.
https://doi.org/10.1016/j.apsusc.2006.08.035

Todorović-Marković B, Draganić IN, Vasiljević-Radović D, Romčević N, Romčević M, Dramićanin MD, Marković Z. Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films. in Applied Surface Science. 2007;253(8):4029-4035.
doi:10.1016/j.apsusc.2006.08.035 .

Todorović-Marković, Biljana, Draganić, Ilija N., Vasiljević-Radović, Dana, Romčević, Nebojša, Romčević, Maja, Dramićanin, Miroslav D., Marković, Zoran, "Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films" in Applied Surface Science, 253, no. 8 (2007):4029-4035,
https://doi.org/10.1016/j.apsusc.2006.08.035 . .

TY  - JOUR
AU  - Todorović-Marković, Biljana
AU  - Draganić, Ilija
AU  - Vasiljević-Radović, Dana
AU  - Romčević, Nebojša
AU  - Romčević, Maja
AU  - Dramićanin, Miroslav
AU  - Marković, Zoran M.
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/272
AB  - In this paper, results of structural modification of fullerene thin films by single and multiple charged boron ions (B+, B3+) are presented. The applied ion energies were in the range of 15 to 45 keV. The characterization of as-deposited and irradiated specimens has been performed by atomic force microscopy, Raman and Fourier transform infrared spectroscopy and UV/VIS spectrophotometry. The results of Raman analysis have shown the formation of amorphous layer after irradiation of fullerene thin films. Fourier transform infrared spectroscopy has confirmed the formation of new B-C bonds in irradiated films at higher fluences (2x1016 cm-2). The morphology of bombarded films has been changed significantly. The optical band gap was found to be reduced from 1.7 to 1.06 eV for irradiated films by B3+ ions and 0.7 eV for irradiated films by B+ ions.
AB  - U radu su prikazani rezultati strukturne modifikacije tankih slojeva fulerena bombardovanjem jednostruko i višestruko naelektrisanim jonima bora (B+, B3+). Energije korišćenih jona su bile u opsegu od 15 do 45 keV. Osobine deponovanih i ozračenih fulerenskih slojeva su proučavane pomoću mikroskopa atomske snage (AFM), Ramanovom i Furijeovom infracrvenom spektroskopijom (FTIR) i UV/VIS spektrometrijom. Rezultati koji su dobijeni na osnovu Ramanove spektroskopije su pokazali da se posle ozračivanja formirao sloj amorfnog ugljenika na površini uzorka. Furijeova infracrvena spektroskopija je pokazala da su se unutar ozračenog sloja formirale veze bora i ugljenika. Morfologija fulerenskih slojeva se značajno promenila posle bombardovanja jonima bora. Utvrđeno je da se energetski procep ozračenih slojeva smanjio sa 1.7 eV na 1.06 eV za slojeve bombardovane trostruko naelektrisanim jonima bora, i na 0.7 eV za slojeve bombardovane B+ jonima.
T2  - Tehnika - Novi materijali
T1  - Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films
T1  - Sinteza amorfnog bor karbida bombardovanjem tankih slojeva fulerena jonima bora
VL  - 15
IS  - 6
SP  - 7
EP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_cer_272
ER  - 

@article{
author = "Todorović-Marković, Biljana and Draganić, Ilija and Vasiljević-Radović, Dana and Romčević, Nebojša and Romčević, Maja and Dramićanin, Miroslav and Marković, Zoran M.",
year = "2006",
abstract = "In this paper, results of structural modification of fullerene thin films by single and multiple charged boron ions (B+, B3+) are presented. The applied ion energies were in the range of 15 to 45 keV. The characterization of as-deposited and irradiated specimens has been performed by atomic force microscopy, Raman and Fourier transform infrared spectroscopy and UV/VIS spectrophotometry. The results of Raman analysis have shown the formation of amorphous layer after irradiation of fullerene thin films. Fourier transform infrared spectroscopy has confirmed the formation of new B-C bonds in irradiated films at higher fluences (2x1016 cm-2). The morphology of bombarded films has been changed significantly. The optical band gap was found to be reduced from 1.7 to 1.06 eV for irradiated films by B3+ ions and 0.7 eV for irradiated films by B+ ions., U radu su prikazani rezultati strukturne modifikacije tankih slojeva fulerena bombardovanjem jednostruko i višestruko naelektrisanim jonima bora (B+, B3+). Energije korišćenih jona su bile u opsegu od 15 do 45 keV. Osobine deponovanih i ozračenih fulerenskih slojeva su proučavane pomoću mikroskopa atomske snage (AFM), Ramanovom i Furijeovom infracrvenom spektroskopijom (FTIR) i UV/VIS spektrometrijom. Rezultati koji su dobijeni na osnovu Ramanove spektroskopije su pokazali da se posle ozračivanja formirao sloj amorfnog ugljenika na površini uzorka. Furijeova infracrvena spektroskopija je pokazala da su se unutar ozračenog sloja formirale veze bora i ugljenika. Morfologija fulerenskih slojeva se značajno promenila posle bombardovanja jonima bora. Utvrđeno je da se energetski procep ozračenih slojeva smanjio sa 1.7 eV na 1.06 eV za slojeve bombardovane trostruko naelektrisanim jonima bora, i na 0.7 eV za slojeve bombardovane B+ jonima.",
journal = "Tehnika - Novi materijali",
title = "Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films, Sinteza amorfnog bor karbida bombardovanjem tankih slojeva fulerena jonima bora",
volume = "15",
number = "6",
pages = "7-13",
url = "https://hdl.handle.net/21.15107/rcub_cer_272"
}

Todorović-Marković, B., Draganić, I., Vasiljević-Radović, D., Romčević, N., Romčević, M., Dramićanin, M.,& Marković, Z. M.. (2006). Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films. in Tehnika - Novi materijali, 15(6), 7-13.
https://hdl.handle.net/21.15107/rcub_cer_272

Todorović-Marković B, Draganić I, Vasiljević-Radović D, Romčević N, Romčević M, Dramićanin M, Marković ZM. Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films. in Tehnika - Novi materijali. 2006;15(6):7-13.
https://hdl.handle.net/21.15107/rcub_cer_272 .

Todorović-Marković, Biljana, Draganić, Ilija, Vasiljević-Radović, Dana, Romčević, Nebojša, Romčević, Maja, Dramićanin, Miroslav, Marković, Zoran M., "Synthesis of amorphous boron carbide by single and multiple charged boron ions bombardment of fullerene thin films" in Tehnika - Novi materijali, 15, no. 6 (2006):7-13,
https://hdl.handle.net/21.15107/rcub_cer_272 .