Abstract

A commensurate modulated structure of (1 − x)Bi 2O 3· xFe 2O 3 is found in the BiFeO 3 ceramics synthesized by the rapid liquid-phase sintering method. Transmission electron microscopy studies show that the superstructure is based on fluorite-type δ-Bi 2O 3 and modulated probably by oxygen vacancy ordering. The existence of such a superstructure may increase the leakage current of BiFeO 3 ceramics.

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