期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.147602
关键词
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资金
- Intel
- Office of Science, Office of Basic Energy Sciences, Materials Science Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Center for Electron Microscopy, Lawrence Berkeley National Laboratory
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Council of Taiwan [NSC-100-2119-M-003]
We report direct experimental evidence for a room-temperature, similar to 130 mu C/cm(2) ferroelectric polarization from the tetragonal-like BiFeO3 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.
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