Mechanical and dielectric failure of BaTiO3 ceramics

Akira Kishimoto, Kunihito Koumoto, Hiroaki Yanagida

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Both at room temperature and above the Curie temperature, Weibull plots for the mechanical and dielectric strengths of BaTiO3 thick films sintered 1300° C to 1400° C showed good a correlation. The present results indicate that the microstructure plays a similar role in both mechanical and dielectric failures and firmly suggest that the fracture origins in both failures are analogous, possibly surface flaws associated with grain size. Specimens sintered at 1450° C showed a bend in the Weibull distribution for mechanical strength. This bimodal Weibull distribution was explained by the assumption that the geometric relation between the ratio of grain sizes to specimen thickness and stress gradient under a three-point bending condition affects the effective tensile stress of the tips of surface flaws.

Original languageEnglish
Pages (from-to)698-702
Number of pages5
JournalJournal of Materials Science
Volume24
Issue number2
DOIs
Publication statusPublished - Feb 1 1989
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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