Abstract
B-site mixed bismuth perovskite oxide of Bi(Mg0.5Ti0.5)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. In situ 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.
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