Abstract
A number of mixed metal oxides with perovskite-like structures are reported. On the sublattice of the smaller cations 1:1 and 1:2 long-range order have been found in the perovskite as well as in the hexagonal barium titanate structure. The Jahn-Teller distortions of these compounds are discussed. Finally the energy terms stabilizing the hexagonal barium titanate structure relative to the perovskite structure are considered. It seems probable that anion polarization and not cation-cation bonding stabilizes the hexagonal barium titanate structure.
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