Genesis of the (111) Twin in Barium Titanate |
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Authors: | Viktor Kraevec Miha Drofenik Drago Kolar |
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Affiliation: | J. Stefan Institute, E. Kardelj University of Ljubljana, 61111 Ljubljana, Slovenia, Yugoslavia |
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Abstract: | On the basis of the topotaxy between BaTiO3 and Ba6Ti17O40 found recently, a model of a nonconservative (111) twin in TiO2-rich BaTiO3 was constructed. The model consists of several (001) layers of Ba6Ti17O40 intergrown between (111) layers of BaTiO3, the core of the twin being a slightly modified double layer of Ba6Ti17O40 containing face-sharing octahedra. Using this model, anomalous grain growth below the eutectic temperature and preferential growth of (111) twins in a reducing atmosphere were explained, as well a nucleation of butterfly twins. |
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Keywords: | twinning barium titanate grain growth crystallography formation |
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