Pressure-Induced Anomalous Phase Transitions and Colossal Enhancements of Piezoelectricity in Ground-State BaTiO3

Pressure-Induced Anomalous Phase Transitions and Colossal Enhancements of Piezoelectricity in Ground-State BaTiO3
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基态 BaTiO3 中压力引起的反常相变和压电的巨大增强

DOI:
10.1088/0256-307x/28/4/046101
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发表时间:
2011-04
影响因子:
3.5
通讯作者:
Tang Gang
Tang Gang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Duan Yi-Feng;Qin Li-Xia;Shi Li-Wei;Tang Gang

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用第一性原理计算研究了静水压力下的菱面体BaTiO3。我们的研究结果表明,就像四方钙钛矿一样,随着压力的增加,这种材料首先在低压下变成准电相,然后在更高的压力下转移到另一个铁电相。我们还发现,在相变区域附近,由于响应于施加的压力,沿不同方向的大原子位移,压电性有了巨大的增强。
Rhombohedral BaTiO3 under hydrostatic pressure is investigated by first principles calculations. Our results show that just like tetragonal perovskites, as pressure increases, this material first becomes para-electric at low pressures, then transfers to another ferroelectric phase at much higher pressures. We also find a giant enhancement of piezoelectricity near the phase-transition regions, due to large atomic displacements along different directions in response to the applied pressures.
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