Effects of oxygen vacancies on polarization stability of barium titanate

Effects of oxygen vacancies on polarization stability of barium titanate
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氧空位对钛酸钡极化稳定性的影响

DOI:
10.1007/s11433-015-5754-8
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发表时间:
2016-01
期刊:
Science China Physics, Mechanics & Astronomy
影响因子:
--
通讯作者:
C. Lu
C. Lu
中科院分区:
其他
文献类型:
--
作者:
J. Wang;Y.G. Shen;F. Song;F.J. Ke;Y.L. Bai;C. Lu

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氧空位是铁电陶瓷中的一种本征点缺陷,通常会导致介电损耗的增加。根据实验观察,认为所有的氧空位都是节能的不利因素。通过分子动力学模拟,我们发现,由于氧空位附近的局域极化转换困难,导致了矫顽场和饱和电场的增大,从而使铁电器件必须承受不断上升的能量消耗。模拟结果还揭示了氧空位对铁电性质的影响。
Oxygen vacancy, a kind of native point defects in ferroelectric ceramics, usually causes an increase of the dielectric loss. Based on experimental observations, it is believed that all of the oxygen vacancies are an unfavorable factor for energy saving. By using molecular dynamics simulations, we show that the increase of coercive and saturated electric fields is due to the difficulty to switch local polarization near an oxygen vacancy, and so that a ferroelectric device has to sustain the rising consumption of energy. The simulation results also uncover how oxygen vacancies influence ferroelectric properties.
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发表时间: 2013-10
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