Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Dielectric properties, Mossbauer study, ESR spectra of Bi2FeTa2O9.5 with pyrochlore structure. / Zhuk, N.A.; Sekushin, N.A.; Semenov, V.G.; Fedorova, A.V.; Selyutin, A.A.; Krzhizhanovskaya, M.G.; Lutoev, V.P.; Makeev, B.A. ; Kharton, V.V.; Sivkov, D.N. ; Shpynova, A.D. .
в: Journal of Alloys and Compounds, Том 903, 163928, 15.05.2022.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Dielectric properties, Mossbauer study, ESR spectra of Bi2FeTa2O9.5 with pyrochlore structure
AU - Zhuk, N.A.
AU - Sekushin, N.A.
AU - Semenov, V.G.
AU - Fedorova, A.V.
AU - Selyutin, A.A.
AU - Krzhizhanovskaya, M.G.
AU - Lutoev, V.P.
AU - Makeev, B.A.
AU - Kharton, V.V.
AU - Sivkov, D.N.
AU - Shpynova, A.D.
N1 - Publisher Copyright: © 2022 Elsevier B.V.
PY - 2022/5/15
Y1 - 2022/5/15
N2 - The pyrochlore with the composition Bi2FeTa2O9.5 was obtained by solid-phase synthesis. The electronic state and the nature of the local environment of iron atoms were studied by electron spin resonance (ESR) and Mossbauer spectroscopy. In the Bi2FeTa2O9.5 ESR spectra a dipolar-broadened line with g similar to 2.05 from Fe3+ ion clusters are observed. This line is the superposition of components with widths of about 150 and 400 mT. On the low-field wing of the band, there is a feature with g similar to 4.3 relating to trace amounts of isolated Fe3+ ions in an octahedral position with a strong rhombic distortion. The Mossbauer spectrum of the Bi2FeTa2O9.5 compound demonstrates a slightly asymmetric doublet. The form of the doublet is re-produced by a superposition of a doublet and a singlet. About 93% of the spectral area of the paramagnetic part of the spectrum falls on the Fe(III)-doublet with IS = 0.365 +/- 0.0020 mm/s, QS = 0.604 +/- 0.034 mm/s, correlated with Fe3+ ions in regular axial octahedral positions. The remaining part is represented by a Fe(III)singlet with IS = 0.176 +/- 0.0288 mm/s from Fe3+ ions in a symmetric environment. The electrical properties of the compound were studied at temperatures of 20 - 450 degrees C in the frequency range of 25 Hz - 1 MHz. It was found that synthesized ceramics exhibit dielectric properties. The permittivity and the dielectric loss tangent at 20 degrees C were determined and are 57 and 0.003 (1 MHz), respectively. (C) 2022 Published by Elsevier B.V.
AB - The pyrochlore with the composition Bi2FeTa2O9.5 was obtained by solid-phase synthesis. The electronic state and the nature of the local environment of iron atoms were studied by electron spin resonance (ESR) and Mossbauer spectroscopy. In the Bi2FeTa2O9.5 ESR spectra a dipolar-broadened line with g similar to 2.05 from Fe3+ ion clusters are observed. This line is the superposition of components with widths of about 150 and 400 mT. On the low-field wing of the band, there is a feature with g similar to 4.3 relating to trace amounts of isolated Fe3+ ions in an octahedral position with a strong rhombic distortion. The Mossbauer spectrum of the Bi2FeTa2O9.5 compound demonstrates a slightly asymmetric doublet. The form of the doublet is re-produced by a superposition of a doublet and a singlet. About 93% of the spectral area of the paramagnetic part of the spectrum falls on the Fe(III)-doublet with IS = 0.365 +/- 0.0020 mm/s, QS = 0.604 +/- 0.034 mm/s, correlated with Fe3+ ions in regular axial octahedral positions. The remaining part is represented by a Fe(III)singlet with IS = 0.176 +/- 0.0288 mm/s from Fe3+ ions in a symmetric environment. The electrical properties of the compound were studied at temperatures of 20 - 450 degrees C in the frequency range of 25 Hz - 1 MHz. It was found that synthesized ceramics exhibit dielectric properties. The permittivity and the dielectric loss tangent at 20 degrees C were determined and are 57 and 0.003 (1 MHz), respectively. (C) 2022 Published by Elsevier B.V.
KW - pyrochlore
KW - iron doping
KW - ESR
KW - Mössbauer spectroscopy
KW - permittivity
KW - Dielectric loss tangent
KW - Iron doping
KW - Pyrochlore
KW - Permittivity
KW - SYSTEM
KW - NEXAFS
KW - EPR
KW - ELECTRICAL-PROPERTIES
KW - SPECTROSCOPY
KW - SUBSOLIDUS PHASE-EQUILIBRIA
KW - Mossbauer spectroscopy
KW - MAGNETIC-PROPERTIES
KW - CERAMICS
UR - https://proxy.library.spbu.ru:2068/science/article/pii/S092583882200319X?via%3Dihub#!
UR - http://www.scopus.com/inward/record.url?scp=85123612786&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/e15e6a81-9f20-31a5-9649-dcabc26b7533/
U2 - 10.1016/j.jallcom.2022.163928
DO - 10.1016/j.jallcom.2022.163928
M3 - Article
VL - 903
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 163928
ER -
ID: 91834891