期刊
JOURNAL OF APPLIED PHYSICS
卷 108, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3504194
关键词
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资金
- China Scholarship Council
- American Academic Exchange Service [(2008) 3012]
- National Science Foundation of China [50428101]
- NSF WMN [DMR0908718]
- NIRT [DMR-0507146]
- National Science Foundation [OCI-0821527]
A modified eighth-order Landau potential was proposed for the BaTiO3 single crystal by taking account into the quantum mechanical effects at low temperature. While all existing thermodynamic potentials for BaTiO3 fail to accurately describe the pressure dependence of ferroelectric transition temperatures, the temperature and hydrostatic pressure phase diagram constructed using the modified potential shows excellent agreement with experimental measurements by Ishidate, Abe, Takahashi, and Mori [Phys. Rev. Lett. 78, 2397 (1997)]. On the basis of the new proposed Landau potential, we calculated the dielectric coefficients, spontaneous polarizations, temperature-electric field phase diagram, and piezoelectric coefficients, all in good agreement well with existing experimental data. (c) 2010 American Institute of Physics. [doi:10.1063/1.3504194]
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