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Formation of Homo‐Template Grains in Bi 0.5 Na 0.5 TiO 3 Prepared by the Reactive‐Templated Grain Growth Process
Author(s) -
Motohashi Takao,
Kimura Toshio
Publication year - 2008
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.1551-2916.2008.02809.x
Subject(s) - materials science , texture (cosmology) , microstructure , stoichiometry , grain growth , chemical composition , grain size , matrix (chemical analysis) , chemical engineering , morphology (biology) , crystallography , metallurgy , composite material , chemistry , organic chemistry , artificial intelligence , computer science , engineering , image (mathematics) , biology , genetics
The effects of chemical composition on texture development have been examined for Bi 0.5 Na 0.5 TiO 3 prepared by the reactive‐templated grain growth method, using stoichiometric, Na‐excess, and Na‐deficient specimens. The highly textured material is obtained by heating the stoichiometric specimen at about 1100°C. Texture development is enhanced in the Na‐excess specimen, and the highly textured specimen is hardly obtained for the Na‐deficient specimen. The chemical composition affects the formation and growth stages of homo‐template grains. Large homo‐template grains form in the Na‐excess specimen and grow at the expense of small matrix grains. These conditions of the preferential growth of homo‐template grains are lost in the Na‐deficient specimen because of the small size of homo‐template grains and a high growth rate of matrix grains. The dependence of microstructure development on chemical composition is discussed based on the structure of the grain surface on an atomic scale.