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2005
Structure
D 2000
24- 013
High Temperature Structural Studies of Ba2BiTaO6. — As revealed by powder
XRD the title compound has an ordered double perovskite structure. Below 250 °C it
crystallizes in the rhombohedral space group R3. Upon heating the compound exhibits
an apparently continuous transition to a cubic structure of space group Fm3m near
250 °C. The rates of thermal expansion in the two phases are noticeably different. The
temperature dependence of both the volume strain and rhombohedral angle show nonlinear behavior. — (ZHOU, Q.; KENNEDY*, B. J.; Solid State Sci. 7 (2005) 3,
287-291; Sch. Chem., Univ. Sydney, Camperdown, N. S. W. 2006, Australia; Eng.)
— W. Pewestorf
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