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Barium orthotitanate : ウィキペディア英語版 | Barium orthotitanate
Barium orthotitanate is the inorganic compound with the chemical formula Ba2TiO4. It is a colourless solid that is of interest because of its relationship to barium titanate, a useful electroceramic. ==Structure==
The solid has two known phases: a low-temperature (β) phase with ''P''21/''n'' symmetry and a high-temperature (α′) phase with ''P''21''nb'' symmetry. The structure of Ba2TiO4 is unusual among the titanates because its titanium atoms sit in a four-oxygen tetrahedron rather than a six-oxygen octahedron.〔
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