Grain boundaries in BaTiO3 with a small cation nonstoichiometry

T. Yamamoto, Y. Ikuhara, Katsuro Hayashi, T. Sakuma

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Abstract

Grain boundary structure in BaTiO3 doped with a small amount of dopants was examined. It was found that grain growth behavior was very sensitive to the substituting sites of dopants, i.e., A- or B-site in a perovskite structure ABO3. Abnormal grain growth takes place in B-site type dopant excess BaTiO3 while normal grain growth occurs in A-site type dopant excess BaTiO3. High-resolution electron microscopy (HRTEM) study associated with electron energy-loss spectroscopy (EELS) revealed that the grain boundaries were facetted with {210} type habits and extra Ti-O2 bonds were formed along the facetted grain boundaries in the compounds doped with B-site type dopants. Controlling the doping ratio of A- and B-site type dopants severely, coarse-grained sinters whose grain size was about 1 mm could be obtained.

Original languageEnglish
Pages (from-to)113-116
Number of pages4
JournalKey Engineering Materials
Volume169
Publication statusPublished - Jan 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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