Site-Selective Calcium Substitution in BaTi2O5: Effect on the Crystal Structure and the Ferroelectric Phase Transition
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概要
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The crystal structure and the ferroelectric phase transition are investigated in 4 mol % Ca-substituted BaTi2O5 synthesized by a containerless method. The synchrotron radiation powder diffraction reveals that the Ca ion prefers to settle at one of two crystallographically nonequivalent Ba sites surrounded by a rather distorted oxygen polyhedron. The crystal lattice is shrunk in the b-axis parallel to the spontaneous polarization in the ferroelectric phase by the substitution. The small amount of the Ca substitution suppresses the ferroelectric instability in BaTi2O5, and the ferroelectric phase transition temperature is significantly lowered by 40 K, which provides a great contrast with the case of Ca substitution in BaTiO3.
- 2012-01-15
著者
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Moriyoshi Chikako
Graduate School Of Science Hiroshima University
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Masuno Atsunobu
Institute Of Industrial Science The University Of Tokyo
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Inoue Hiroyuki
Institute For Chemotherapy M.c.r.e.
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Moriyoshi Chikako
Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
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Kuroiwa Yoshihiro
Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
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Inoue Hiroyuki
Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan
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Masuno Atsunobu
Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan
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