TY  - JOUR
AU  - Pavlović, Vera P.
AU  - Tošić, Dragana
AU  - Dojčilović, Radovan
AU  - Dudić, Duško
AU  - Dramićanin, Miroslav D.
AU  - Medić, Mina
AU  - McPherson, Michael M.
AU  - Pavlović, Vladimir B.
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/10535
AB  - Na0.25K0.25Bi0.5TiO3 (NKBT) perovskite particles are synthesized by solid-state method and used as a filler for polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) co-polymer. X-ray diffraction analysis of NKBT powders shows that the particles have a rhombohedral perovskite crystal structure (R3c symmetry). Raman spectroscopy reveals that the co-polymer crystallizes predominantly into the mixture of polar β- and γ-crystals, while there is also a contribution of the non-polar α-crystal phase. The introduction of the NKBT into the PVDF-HFP results with an increase in effective dielectric permittivity and this effect depends on the inorganic content in the composite. The most interesting result of the present study is that the introduction of NKBT particles induces the appearance of an additional transition peak in the dielectric spectra of the co-polymer matrix. At the fixed frequency of ~2 kHz, the observed process appears at ~10 °C (about 45° above the glass transition temperature) and its magnitude strongly depends on the amount of the NKBT in the composite. Dielectric spectroscopy measurements of the composites are carried out in the wide range of frequencies (from 0.1 Hz to 1 MHz) and temperatures (from −100 to 100 °C). They reveal that the novel process can be clearly distinguished in the frequency range between 160 Hz and ~50 kHz.
PB  - Elsevier BV
T2  - Polymer Testing
T1  - PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix
SP  - 107093
VL  - 96
DO  - 10.1016/j.polymertesting.2021.107093
UR  - https://hdl.handle.net/21.15107/rcub_dais_10535
ER  - 

@article{
author = "Pavlović, Vera P. and Tošić, Dragana and Dojčilović, Radovan and Dudić, Duško and Dramićanin, Miroslav D. and Medić, Mina and McPherson, Michael M. and Pavlović, Vladimir B. and Vlahović, Branislav and Đoković, Vladimir",
year = "2021",
abstract = "Na0.25K0.25Bi0.5TiO3 (NKBT) perovskite particles are synthesized by solid-state method and used as a filler for polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) co-polymer. X-ray diffraction analysis of NKBT powders shows that the particles have a rhombohedral perovskite crystal structure (R3c symmetry). Raman spectroscopy reveals that the co-polymer crystallizes predominantly into the mixture of polar β- and γ-crystals, while there is also a contribution of the non-polar α-crystal phase. The introduction of the NKBT into the PVDF-HFP results with an increase in effective dielectric permittivity and this effect depends on the inorganic content in the composite. The most interesting result of the present study is that the introduction of NKBT particles induces the appearance of an additional transition peak in the dielectric spectra of the co-polymer matrix. At the fixed frequency of ~2 kHz, the observed process appears at ~10 °C (about 45° above the glass transition temperature) and its magnitude strongly depends on the amount of the NKBT in the composite. Dielectric spectroscopy measurements of the composites are carried out in the wide range of frequencies (from 0.1 Hz to 1 MHz) and temperatures (from −100 to 100 °C). They reveal that the novel process can be clearly distinguished in the frequency range between 160 Hz and ~50 kHz.",
publisher = "Elsevier BV",
journal = "Polymer Testing",
title = "PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix",
pages = "107093",
volume = "96",
doi = "10.1016/j.polymertesting.2021.107093",
url = "https://hdl.handle.net/21.15107/rcub_dais_10535"
}

Pavlović, V. P., Tošić, D., Dojčilović, R., Dudić, D., Dramićanin, M. D., Medić, M., McPherson, M. M., Pavlović, V. B., Vlahović, B.,& Đoković, V.. (2021). PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix. in Polymer Testing
Elsevier BV., 96, 107093.
https://doi.org/10.1016/j.polymertesting.2021.107093
https://hdl.handle.net/21.15107/rcub_dais_10535

Pavlović VP, Tošić D, Dojčilović R, Dudić D, Dramićanin MD, Medić M, McPherson MM, Pavlović VB, Vlahović B, Đoković V. PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix. in Polymer Testing. 2021;96:107093.
doi:10.1016/j.polymertesting.2021.107093
https://hdl.handle.net/21.15107/rcub_dais_10535 .

Pavlović, Vera P., Tošić, Dragana, Dojčilović, Radovan, Dudić, Duško, Dramićanin, Miroslav D., Medić, Mina, McPherson, Michael M., Pavlović, Vladimir B., Vlahović, Branislav, Đoković, Vladimir, "PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix" in Polymer Testing, 96 (2021):107093,
https://doi.org/10.1016/j.polymertesting.2021.107093 .,
https://hdl.handle.net/21.15107/rcub_dais_10535 .

TY  - CONF
AU  - Medić, Mina
AU  - Nikolić, Marko G.
AU  - Lojpur, Vesna
AU  - Mančić, Lidija
AU  - Milošević, Olivera
AU  - Dramićanin, Miroslav
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/812
AB  - Thermographic phosphors are oxides doped With rare-earth or transition metal ions that will emit visible, Infrared, or UV light upon excitation from an external energy source This materials have received significant attention due to the potential application as optical temperature sensor In this report, we have investigated yttrium oxide co-doped with changeable ytterbium to erbium ratio (Y1.94YbO.05Er001 and Y1 97YbO 02ErO 01) fabricated through hydrothermal synthesis Process conditions (2h, 200 'C) and additional thermal treatment (3h, 1100 'C) allows obtaining nanoparticles of appropriate composition and morphology which further affect on improved photoluminescent characteristics. The fluorescence Intensity ratio (FIR) technique is used to examine potential usage of samples as low temperature sensors. This optical method is based on ratio between two emission lines or areas In photoluminescence spectrum which show temperature dependence. Photoluminescent measurements (PL) are recorded In the temperature range from 10K to 300 K under 978 nm exciting
wavelength Observing changes In following transitions blue 2H912~4115/2, green (2H1112, 4S3/2) ~ 411512 and red 4F912~4115/2 Obtained experimental results imply that the fluorescent intensity ratio of the blue, green and red lines
and areas show significant temperature sensitivity and can be used as low temperature sensor.
PB  - San Francisco : Materials Research Society
C3  - 2013 MRS Spring Meeting and Exhibit, April 1-5, 2013, San Francisco. California: Program and exhibit guide
T1  - Thermographic Properties of Up-conversion Emission of Y2O3:Yb, Er Nanophosphors Obtained through Hydrothermal Synthesis
UR  - https://hdl.handle.net/21.15107/rcub_dais_812
ER  - 

@conference{
author = "Medić, Mina and Nikolić, Marko G. and Lojpur, Vesna and Mančić, Lidija and Milošević, Olivera and Dramićanin, Miroslav",
year = "2013",
abstract = "Thermographic phosphors are oxides doped With rare-earth or transition metal ions that will emit visible, Infrared, or UV light upon excitation from an external energy source This materials have received significant attention due to the potential application as optical temperature sensor In this report, we have investigated yttrium oxide co-doped with changeable ytterbium to erbium ratio (Y1.94YbO.05Er001 and Y1 97YbO 02ErO 01) fabricated through hydrothermal synthesis Process conditions (2h, 200 'C) and additional thermal treatment (3h, 1100 'C) allows obtaining nanoparticles of appropriate composition and morphology which further affect on improved photoluminescent characteristics. The fluorescence Intensity ratio (FIR) technique is used to examine potential usage of samples as low temperature sensors. This optical method is based on ratio between two emission lines or areas In photoluminescence spectrum which show temperature dependence. Photoluminescent measurements (PL) are recorded In the temperature range from 10K to 300 K under 978 nm exciting
wavelength Observing changes In following transitions blue 2H912~4115/2, green (2H1112, 4S3/2) ~ 411512 and red 4F912~4115/2 Obtained experimental results imply that the fluorescent intensity ratio of the blue, green and red lines
and areas show significant temperature sensitivity and can be used as low temperature sensor.",
publisher = "San Francisco : Materials Research Society",
journal = "2013 MRS Spring Meeting and Exhibit, April 1-5, 2013, San Francisco. California: Program and exhibit guide",
title = "Thermographic Properties of Up-conversion Emission of Y2O3:Yb, Er Nanophosphors Obtained through Hydrothermal Synthesis",
url = "https://hdl.handle.net/21.15107/rcub_dais_812"
}

Medić, M., Nikolić, M. G., Lojpur, V., Mančić, L., Milošević, O.,& Dramićanin, M.. (2013). Thermographic Properties of Up-conversion Emission of Y2O3:Yb, Er Nanophosphors Obtained through Hydrothermal Synthesis. in 2013 MRS Spring Meeting and Exhibit, April 1-5, 2013, San Francisco. California: Program and exhibit guide
San Francisco : Materials Research Society..
https://hdl.handle.net/21.15107/rcub_dais_812

Medić M, Nikolić MG, Lojpur V, Mančić L, Milošević O, Dramićanin M. Thermographic Properties of Up-conversion Emission of Y2O3:Yb, Er Nanophosphors Obtained through Hydrothermal Synthesis. in 2013 MRS Spring Meeting and Exhibit, April 1-5, 2013, San Francisco. California: Program and exhibit guide. 2013;.
https://hdl.handle.net/21.15107/rcub_dais_812 .

Medić, Mina, Nikolić, Marko G., Lojpur, Vesna, Mančić, Lidija, Milošević, Olivera, Dramićanin, Miroslav, "Thermographic Properties of Up-conversion Emission of Y2O3:Yb, Er Nanophosphors Obtained through Hydrothermal Synthesis" in 2013 MRS Spring Meeting and Exhibit, April 1-5, 2013, San Francisco. California: Program and exhibit guide (2013),
https://hdl.handle.net/21.15107/rcub_dais_812 .

TY  - CONF
AU  - Lojpur, Vesna
AU  - Nikolić, Marko G.
AU  - Medić, Mina
AU  - Mančić, Lidija
AU  - Milošević, Olivera
AU  - Dramićanin, Miroslav
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/509
AB  - In recent years trivalent rare earth doped materials have received significant attention for optical temperature sensors. In these materials ratio of fluorescence emissions from different energy levels exhibit strong temperature dependence. Synthesized Y2O3:Yb,Tm and Y2O3:Yb,Ho powders were obtained via spray pyrolysis at 900 °C using 0.1 M nitrate precursor. Using laser excitation at 978 nm we investigated upconversion emission of these powders and recorded characteristic transitions: 1D2→3F4, 1G4→3H6, 1G4→3F4, 3F2,3→3H6, 1D2→3F3, 1G4→3H6, 3H4→3H6 for Tm3+ and 5F4, 5S2→5I8, 5F5→5I8, 5F4, 5S2→5I7 for Ho3+. Further we analyzed temperature dependence of fluorescence intensity ratios of different Stark components in the range from 10K to 300K. Several of these ratios exhibit significant temperature sensitivity, with the largest value of 0.08 K-1.
C3  - 2nd International Conference on Optical, Electronic and Electrical Materials, 5-7 August 2012, Shanghai, China
T1  - Low temperature sensitivity of upconversion emission in Y2O3:Yb,Tm and Y2O3:Yb,Ho powders
UR  - https://hdl.handle.net/21.15107/rcub_dais_509
ER  - 

@conference{
author = "Lojpur, Vesna and Nikolić, Marko G. and Medić, Mina and Mančić, Lidija and Milošević, Olivera and Dramićanin, Miroslav",
year = "2012",
abstract = "In recent years trivalent rare earth doped materials have received significant attention for optical temperature sensors. In these materials ratio of fluorescence emissions from different energy levels exhibit strong temperature dependence. Synthesized Y2O3:Yb,Tm and Y2O3:Yb,Ho powders were obtained via spray pyrolysis at 900 °C using 0.1 M nitrate precursor. Using laser excitation at 978 nm we investigated upconversion emission of these powders and recorded characteristic transitions: 1D2→3F4, 1G4→3H6, 1G4→3F4, 3F2,3→3H6, 1D2→3F3, 1G4→3H6, 3H4→3H6 for Tm3+ and 5F4, 5S2→5I8, 5F5→5I8, 5F4, 5S2→5I7 for Ho3+. Further we analyzed temperature dependence of fluorescence intensity ratios of different Stark components in the range from 10K to 300K. Several of these ratios exhibit significant temperature sensitivity, with the largest value of 0.08 K-1.",
journal = "2nd International Conference on Optical, Electronic and Electrical Materials, 5-7 August 2012, Shanghai, China",
title = "Low temperature sensitivity of upconversion emission in Y2O3:Yb,Tm and Y2O3:Yb,Ho powders",
url = "https://hdl.handle.net/21.15107/rcub_dais_509"
}

Lojpur, V., Nikolić, M. G., Medić, M., Mančić, L., Milošević, O.,& Dramićanin, M.. (2012). Low temperature sensitivity of upconversion emission in Y2O3:Yb,Tm and Y2O3:Yb,Ho powders. in 2nd International Conference on Optical, Electronic and Electrical Materials, 5-7 August 2012, Shanghai, China.
https://hdl.handle.net/21.15107/rcub_dais_509

Lojpur V, Nikolić MG, Medić M, Mančić L, Milošević O, Dramićanin M. Low temperature sensitivity of upconversion emission in Y2O3:Yb,Tm and Y2O3:Yb,Ho powders. in 2nd International Conference on Optical, Electronic and Electrical Materials, 5-7 August 2012, Shanghai, China. 2012;.
https://hdl.handle.net/21.15107/rcub_dais_509 .

Lojpur, Vesna, Nikolić, Marko G., Medić, Mina, Mančić, Lidija, Milošević, Olivera, Dramićanin, Miroslav, "Low temperature sensitivity of upconversion emission in Y2O3:Yb,Tm and Y2O3:Yb,Ho powders" in 2nd International Conference on Optical, Electronic and Electrical Materials, 5-7 August 2012, Shanghai, China (2012),
https://hdl.handle.net/21.15107/rcub_dais_509 .