An electrical field-induced structural effect in strontium titanate at room temperature
An electrical field-induced structural effect in strontium titanate at room temperature
复制标题
室温下钛酸锶中电场诱导的结构效应
DOI：
10.1007/s00339-004-3063-6
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Paufler
中科院分区：
文献类型：
--
作者：
D. Meyer;A. Levin;S. Bayer;A. Gorbunov;W. Pompe;P. Paufler
在室温下观察到电场诱导的SrTiO_3 [001]单晶片的可逆结构畸变。结构变化的特点是在原位通过X射线衍射。它的结论是，效果需要的立方晶体结构的变形，因为它是目前只在粗糙的未抛光的一面的晶片。发现这种现象的出现取决于电场的方向。结构变化，取决于电场强度，是完全可逆的。对于可能的机电耦合现象，必须考虑压电和电致伸缩效应。立方SrTiO 3属于中心对称点群m\overline{3}m$
因此，不存在压电效应，而可能发生类似电致伸缩的二阶效应。特殊约束的结果所产生的特性进行了讨论。
AbstractAn electric field-induced reversible structural distortion at room temperature is observed at an as-cut single-crystalline SrTiO3 [001] wafer. The structural changes have been characterised in situ by means of X-ray diffraction. It is concluded that the effect requires a distortion of the cubic crystal structure, as it was present only at the rough unpolished side of the wafer. The appearance of the phenomenon was found to depend on the direction of the electric field. Structural changes, depending on the electric field strength, were completely reversible. Regarding the possible electromechanical coupling phenomena, the piezoelectric and electrostrictive effects have to be considered. Cubic SrTiO3 belongs to the centrosymmetric point group $m\overline{3}m$
; hence, no piezoelectric effect is present, whereas second-order effects like electrostriction may occur. Peculiarities arising as a result of the special constraints are discussed.