Antiferroelectric Phase in Sm Doped BiFeO3
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University of Maryland We have identified a composition in Sm doped BiFeO3 which exhibits a complex mixture of ferroelectric phase and an antiferroelectric phase. Left shows a high resolution TEM image of a region displaying an interface between a rhombohedral ferroelectric phase (FE matrix) and antiferroelectric (antipolar clusters). Right schematically shows how antiparallel shift in A-site cations (arrows) gives rise to antiferroelectric structure.
C. J. Cheng, A. Y. Borisevich, D. Kan, I. Takeuchi and V. Nagarajan, "Nanoscale Structural and Chemical Properties of Antipolar Clusters in Sm-Doped BiFeO3 Ferroelectric Epitaxial Thin Films." Chemistry of Materials 22, 2588-96 (2010).
http://pubs.acs.org/doi/full/10.1021/cm903618y
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