|Title:||Microscopic Origin of the Giant Ferroelectric Polarization in Tetragonal-like BiFeO(3)|
|Authors:||Zhang, J. X.|
Rossell, M. D.
Wang, C. H.
Kuo, C. Y.
Heron, J. T.
Zeches, R. J.
Lin, H. J.
Chen, C. T.
Tjeng, L. H.
Department of Materials Science and Engineering
|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.|
|Journal:||PHYSICAL REVIEW LETTERS|
|Appears in Collections:||Articles|