Sintering process and microwave dielectric properties of Bi 8TiO14 ceramics

Mi Ri Joung, Byoung Jik Jeong, Jin Seong Kim, Sung Ran Woo, Hyun Min Park, Sahn Nahm

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The formation of a homogeneous Bi8TiO14 phase was successfully achieved in a specimen calcined at 600°C. However, a Bi 4Ti3O12 secondary phase also developed in specimens calcined at temperatures higher than 600°C, probably because of Bi2O3 evaporation. For specimens sintered above 800°C, a small amount of the Bi8TiO14 phase melted during sintering, with the liquid phase contributing to the densification of the specimens; however, Bi4Ti3O12 and Bi 12TiO20 secondary phases were still formed in these specimens. The microwave dielectric properties of the Bi8TiO 14 phase were considerably affected by variations in the microstructure of the specimens. When the sintering temperature exceeded 825°C, the amount of secondary phases increased, and this decreased the density and Q×f values of the specimens. Bi8TiO14 ceramics sintered at 825°C exhibited promising microwave dielectric properties, with εr = 47.4, Q×f = 5370 GHz, and τf = -16.01 ppm/°C.

Original languageEnglish
Pages (from-to)2491-2495
Number of pages5
JournalJournal of the American Ceramic Society
Volume97
Issue number8
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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