Abstract

The compositional and thermal evolution of the crystal structure of the solid solution Bi1-xSmxFeO3 synthesized at a high pressure of 4 GPa was investigated. It was found that Bi1-xSmxFeO3 with x = 0.10 and 0.15 had an antipolar PbZrO3-type structure with a √2a×2√2a×4a perovskite superstructure at room temperature, while that with x = 0.05 had the same structure as the parent BiFeO3 (x = 0). The x = 0.10 sample transforms from an antipolar PbZrO3-type orthorhombic structure to a polar BiFeO3-type rhombohedral structure and eventually to a nonpolar GdFeO3-type structure on heating as Zr-rich PZT.

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