%0 Journal Article
%K transmission electron microscopy
%K room temperature
%K Polarization
%K ferroelectricity
%K Ferroelectric polarization
%K First-principles calculation
%K scanning transmission electron microscopy
%K X ray absorption spectroscopy
%K Experimental evidence
%K Lone pair electrons
%K Oxygen octahedra
%A J.X Zhang
%A Q He
%A M Trassin
%A W Luo
%A D Yi
%A M.D Rossell
%A P Yu
%A L You
%A C.H Wang
%A C.Y Kuo
%A J.T Heron
%A Z Hu
%A R.J Zeches
%A H.J Lin
%A A Tanaka
%A C.T Chen
%A L.H Tjeng
%A Y.-H Chu
%A Ramamoorthy Ramesh
%B Physical Review Letters
%D 2011
%G eng
%R 10.1103/PhysRevLett.107.147602
%T Microscopic origin of the giant ferroelectric polarization in tetragonal-like BiFeO3
%V 107
%X We report direct experimental evidence for a room-temperature, ∼130μC/cm2 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. © 2011 American Physical Society.