Low-temperature dielectric relaxations in Y-doped strontium titanate ceramics
authors Tkach, A; Vilarinho, PM; Almeida, A
nationality International
journal JOURNAL OF PHYSICS D-APPLIED PHYSICS
author keywords dielectric relaxation; high-permittivity ceramics; doping
keywords OXIDE FUEL-CELLS; ELECTRICAL-CONDUCTIVITY; ANODE MATERIALS; SRTIO3; MICROSTRUCTURE; SPECTROSCOPY; BI-SRTIO3; RELAXOR
abstract The structural and low-frequency dielectric properties of Y-doped strontium titanate ceramics prepared by the conventional mixed oxide method are investigated. The lattice parameter is found to decrease linearly in the Sr1-1.5xYxTiO3 system, confirming the incorporation of Y onto the Sr site of perovskite lattice of strontium titanate up to the solid solubility limit below x = 0.05. The real and imaginary parts of the dielectric permittivity of Sr1-1.5xYxTiO3 ceramics exhibit a relaxation between 100 Hz and 1 MHz in the temperature range 10-40 K, slightly shifting to higher temperatures with increasing Y content. Such dielectric behavior, yielding real part of the dielectric permittivity up to 35 000, is attributed to the relaxation of individual dipoles formed by off-center displacement of Y3+ ions on Sr sites in a highly polarizable lattice of strontium titanate. The other dielectric relaxation observed in Sr1-1.5xYxTiO3 from 125 to 300 K is attributed to the oxygen vacancy related mechanisms.
publisher IOP PUBLISHING LTD
issn 0022-3727
year published 2015
volume 48
issue 8
digital object identifier (doi) 10.1088/0022-3727/48/8/085302
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000349675600006
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  impact metrics
times cited (wos core): 3
journal impact factor (jcr 2016): 2.588
5 year journal impact factor (jcr 2016): 2.747
category normalized journal impact factor percentile (jcr 2016): 70.408
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