High-temperature dielectrics in the BiScO 3-BaTiO 3-(K 1/2Bi 1/2)TiO 3 ternary system

Jong Bong Lim, Shujun Zhang, Namchul Kim, Thomas R. Shrout

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Abstract

Perovskite solid solution in the (1-x)[0.4BiScO 3-0.6BaTiO 3]+x (K 1/2Bi 1/2)TiO 3 [BSBT-KBTx] 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 (ε r) (>1700 at RT) and low dielectric loss over the temperature range from 100° to 300°C, with flat temperature coefficients of permittivity (TCεs). 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.

Original languageEnglish (US)
Pages (from-to)679-682
Number of pages4
JournalJournal of the American Ceramic Society
Volume92
Issue number3
DOIs
StatePublished - Mar 1 2009

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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