Title: Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO(3)
Authors: Zhang, J. X.
He, Q.
Trassin, M.
Luo, W.
Yi, D.
Rossell, M. D.
Yu, P.
You, L.
Wang, C. H.
Kuo, C. Y.
Heron, J. T.
Hu, Z.
Zeches, R. J.
Lin, H. J.
Tanaka, A.
Chen, C. T.
Tjeng, L. H.
Chu, Y-H.
Ramesh, R.
Department of Materials Science and Engineering
Issue Date: 29-Sep-2011
Abstract: We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO(3) phase. The physical origin of this remarkable enhancement of ferroelectric polarization has been investigated by a combination of x-ray absorption spectroscopy, scanning transmission electron microscopy, and first principles calculations. A large strain-induced Fe-ion displacement relative to the oxygen octahedra, combined with the contribution of Bi 6s lone pair electrons, is the mechanism driving the large ferroelectric polarization in this tetragonal-like phase.
URI: http://dx.doi.org/10.1103/PhysRevLett.107.147602
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.107.147602
Volume: 107
Issue: 14
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