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High‐Temperature Dielectrics in the BiScO 3 –BaTiO 3 –(K 1/2 Bi 1/2 )TiO 3 Ternary System
Author(s) -
Lim Jong Bong,
Zhang Shujun,
Kim Namchul,
Shrout Thomas R.
Publication year - 2009
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.1551-2916.2009.02973.x
Subject(s) - materials science , dielectric , ceramic , sintering , permittivity , ternary operation , dielectric loss , perovskite (structure) , atmospheric temperature range , capacitor , solid solution , activation energy , dopant , ferroelectric ceramics , analytical chemistry (journal) , condensed matter physics , mineralogy , ferroelectricity , thermodynamics , composite material , optoelectronics , crystallography , electrical engineering , metallurgy , chemistry , doping , voltage , physics , chromatography , computer science , programming language , engineering
Perovskite solid solution in the (1− x )[0.4BiScO 3 –0.6BaTiO 3 ]+ x (K 1/2 Bi 1/2 )TiO 3 [BSBT–KBT x ] system was synthesized using conventional sintering and hot‐isostatic pressing. Dielectric properties of BSBT ceramics with different dopant levels of KBT were characterized as a function of temperature and frequency for potential use of high‐temperature capacitors. The BSBT ceramics with KBT exhibited high dielectric permittivities (ɛ r ) (>1700 at RT) and low dielectric loss over the temperature range from 100° to 300°C, with flat temperature coefficients of permittivity (TCɛs). In addition, BSBT ceramics with increasing KBT were observed to possess dielectric relaxation characteristics at temperatures (>RT) as observed in lead‐based relaxors. Furthermore, high energy densities, being on the order of 4.0 J/cm 3 at 220 kV/cm was observed for the BSBT–KBT20 ceramics from the electric‐field polarization behavior.