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Dielectric Properties of Ceramics in the System (Sr 0.50 Pb 0.25 Ca 0.25 )TiO 3 ‐Bi 2 O 3 ·3TiO 2 and Their Applications in a High‐Voltage Capacitor
Author(s) -
NISHIGAKI SUSUMU,
MURANO KANJI,
OHKOSHI AKIO
Publication year - 1982
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.1151-2916.1982.tb10781.x
Subject(s) - dielectric , materials science , hysteresis , permittivity , analytical chemistry (journal) , ferroelectricity , ceramic , ferroelectric ceramics , atmospheric temperature range , condensed matter physics , relaxation (psychology) , capacitor , mineralogy , chemistry , electrical engineering , voltage , optoelectronics , physics , thermodynamics , composite material , psychology , social psychology , engineering , chromatography
The dielectric behavior of (1‐ x )(Sr 0.5 Pb 0.25 Ca 0.25 ) TiO 3 ‐x(Bi 2 O 3 ·3TiO 2 ) was studied using x=O to 8.25 mol%. Around the point at which x equals 1.56 mol%, the following phenomena were observed: (1) At −;22°C, the weak field permittivity increased substantially with a dc bias field, becoming more than twice the zero bias value at a field of 3 kV/mm; (2) the permittivity peak shifted markedly toward a high temperature under a dc bias field; (3) relaxation behavior was evident; and (4) there are large hysteresis loops at low temperatures and double hysteresis loops, which seem to be related to a field‐enforced ferroelectric phase, in a wide temperature range. We used dielectrics with an optimized composition of x =4.30 mol% in a small, highly reliable, 15‐kV high‐voltage ceramic capacitor.