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Dielectric relaxation investigations in barium strontium titanate glass‐ceramics: Thermally stimulated depolarization current technique
Author(s) -
Zhao Zhenlei,
Zhang Yong,
Zhang Qian,
Song Xiaozhen,
Zhu Jia,
Wang Xiangrong,
Zheng Zhiqin
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431119
Subject(s) - materials science , dielectric , relaxation (psychology) , crystallinity , ceramic , polarization (electrochemistry) , strontium titanate , barium , glass ceramic , analytical chemistry (journal) , barium titanate , depolarization , mineralogy , dipole , strontium barium niobate , space charge , composite material , ferroelectricity , optoelectronics , chemistry , metallurgy , medicine , psychology , social psychology , physics , organic chemistry , chromatography , quantum mechanics , endocrinology , electron
Different dielectric relaxation processes in barium strontium titanate glass‐ceramics have been investigated using the thermally stimulated depolarization current (TSDC) technique. The TSDC results obtained from the glass‐ceramics polarized under various polarization conditions show the presence of two peaks designated as A and B in ascending order of temperature, respectively. The peak A is determined to be of dipole origin and assumed to be associated with a defect complex. In addition, the peak B is due to space‐charge polarization arising from the interface between the crystalline phases and the glass matrix. It is supposed to be associated with the relaxation of oxygen vacancies. The TSDC characteristics demonstrate that the degree of crystallinity in glass‐ceramics is a predominant factor in deciding the features of dielectric relaxation mechanisms. TSDC plots for the BST glass‐ceramic samples sintered at various temperatures with the same polarization conditions.