Ferroelastic Properties of Lead Zirconate Titanate Ceramics
Ferroelastic Properties of Lead Zirconate Titanate Ceramics
复制标题
DOI：
10.1111/j.1151-2916.1996.tb09027.x
复制
发表时间：
2005-08
影响因子：
3.9
通讯作者：
A. Schäufele;K. Härdtl
中科院分区：
文献类型：
--
作者：
A. Schäufele;K. Härdtl
为了提高多层执行器的可靠性，计算运行期间设备内部的机械应力非常重要。本文表明，弹性常数 s 的小信号值不足以描述锆钛酸铅（PZT）陶瓷的复杂行为。因此，压缩应变和去极化已被测量为平行于极化方向施加的大信号应力的函数。应变和去极化的非线性依赖性可以通过域过程清楚地解释。对软质和硬质 PZT 陶瓷进行了研究。在硬质 PZT 中，域切换出现在比软质 PZT 更高的应力下。此外，在硬 PZT 中，域在卸载期间部分切换回来。畴切换过程所需的临界应力（矫顽应力）显示出对 Zr:Ti 比率的依赖性，这与矫顽场的依赖性非常相似。还检查了平行于极化方向施加并叠加在压缩实验上的电场的影响。矫顽应力与电场线性相关。这种关系的线性系数由域切换引起的去极化与压缩应变的比率给出。
To increase the reliability of multilayer actuators, calculation of the mechanical stress inside the device during operation is important. This paper shows that the small-signal value of the elastic constant s is not sufficient to describe the complicated behavior of lead zirconate titanate (PZT) ceramics. Therefore, compressive strain and depolarization have been measured as a function of large-signal stress applied parallel to the poling direction. The nonlinear dependence of the strain and depolarization can clearly be explained by domain processes. Soft and hard PZT ceramics have been investigated. In hard PZT, domain switching appears at higher stresses than in soft PZT. Moreover, in hard PZT, the domains partly switch back during unloading. The critical stress (coercive stress) necessary for a domain-switching process shows a dependence on the Zr:Ti ratio that is quite similar to the dependence of the electric coercive field. The influence of an electric field applied parallel to the poling direction and superimposed on the compression experiment also has been examined. The coercive stress depends linearly on the electric field. The linear coefficient of this relation is given by the ratio of depolarization to compressive strain caused by domain switching.