Local Structure Analysis of Bi(Mg_0.5Ti_0.5)O₃ Grown by High Pressure Synthesis

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概要

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• $B$-site mixed bismuth perovskite oxide of Bi(Mg_0.5Ti_0.5)O₃ (BMT) was grown by high-pressure and high-temperature synthesis to achieve a morphotropic phase boundary induced by pressure. Two types of BMT crystal were obtained: one has an orthorhombic structure and the other has a rhombohedral structure. <i>In situ</i> high-pressure and high-temperature X-ray diffraction measurements were performed. It was clarified that the orthorhombic structure is stabilized in the ambient-pressure phase and the rhombohedral structure is stabilized in the high pressure phase. We also performed local structure analysis by atomic pair-distribution function analysis. The similarity of local structures in the orthorhombic and rhombohedral BMT crystals was revealed, and this similarity enables phase transition under pressure.

• 2011-09-25

著者

• Saitoh Hiroyuki

  Condensed Matter Science Division Quantum Beam Science Directorate Japan Atomic Energy Agency

• Yoneda Yasuhiro

  Reaction Dynamics Research Division, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan

• Yoshii Kenji

  Reaction Dynamics Research Division, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo 679-5148, Japan

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