The effect of strain on the domain switching of ferroelectric polycrystals

The effect of strain on the domain switching of ferroelectric polycrystals
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应变对铁电多晶磁畴转换的影响

DOI:
10.1063/1.4907574
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发表时间:
2015-02
影响因子:
3.2
通讯作者:
Ma Z.
Ma Z.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Tong Y.;Liu M.;Chen H. M.;Li G. P.;Fang H.;Wang J.;Ma Z.

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利用相场模型研究了外加应变对铁电多晶在不同外加电场下的非线性机电行为的影响。模拟结果表明,在不加电场的情况下,拉应变下的电场引起的磁畴转变比压缩应变下的更容易,这是因为在拉应变下比在压应变下更容易形成多磁畴结构。研究还发现,压缩失配应变使宏观矫顽场和剩余极化增加,而拉伸失配应变使宏观矫顽场和剩余极化均减小。此外,压缩应变降低了非线性介电常数,而拉伸应变增加了非线性介电常数。
The effect of external strain on the non-linear electromechanical behavior of a ferroelectric poly-crystal is investigated under different applied electric fields by using a phase field model. Simulation results show that the domain switching induced by electric field under a tensile strain is much easier than that under a compressive strain, which is attributed to that a multi-domain structure can be more easily formed under the tensile strain than in the case of compressive strain when the electric field is absent. It is also found that a compressive misfit strain increases the macroscopic coercive field and remnant polarization while a tensile misfit strain decreases both of them. In addition, a compressive strain decreases the non-linear dielectric constant while a tensile strain increases it.
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