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Dielectric Characteristics of Bismuth Oxide Solid Solutions with a Fluorite‐Like Crystal Structure
Author(s) -
Valant Matjaz,
Suvorov Danilo
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01056.x
Subject(s) - fluorite , dielectric , tetragonal crystal system , permittivity , materials science , solid solution , crystal structure , bismuth , condensed matter physics , polarization (electrochemistry) , space charge , mineralogy , chemistry , crystallography , optoelectronics , physics , metallurgy , electron , quantum mechanics
A series of Bi 2 O 3 ‐rich solid solutions with a fluorite‐like crystal structure have been synthesized and analyzed with respect to their dielectric properties as functions of temperature and frequency. The existence of several common dielectric characteristics indicates a strong influence of the fluorite prototype cell on the frequency and temperature dependence of the dielectric properties. These characteristics, common to Bi 2 O 3 solid solutions with the face‐centered cubic δ structure, the tetragonal β structure, and the rhombohedral anti‐α‐AgI crystal structure, are (i) a frequency‐dispersive increase in permittivity and dielectric losses because of a space‐charge polarization, (ii) a frequency‐independent permittivity and a linear temperature dependence of permittivity with a positive trend in the low‐temperature range where the space‐charge polarization is insignificant, and (iii) two frequency‐dispersive relaxations above room temperature.