Domain‐Switching Criteria for Ferroelectric Materials Subjected to Electrical and Mechanical Loads
Domain‐Switching Criteria for Ferroelectric Materials Subjected to Electrical and Mechanical Loads
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DOI：
10.1111/j.1551-2916.2004.00395.x
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发表时间：
2004-03
影响因子：
3.9
通讯作者：
C. Sun;A. Achuthan
中科院分区：
文献类型：
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作者：
C. Sun;A. Achuthan
本文简要回顾了现有的畴变判据，并将基于这些畴变判据的预测结果分别与锆钛酸铅镧（PLZT）和锆钛酸铅（PZT）中180°和90°畴变的实验数据进行了比较。结果发现，预测不符合实验结果。出于这一观察，提出了一个新的域切换标准的内部能量密度的机械和电气负载相结合。基于对铁电材料原子结构的考虑，人们认识到180°和90°畴变是由不同的机制引起的，因此，需要不同的临界内部能量密度来进行切换。新的标准被发现产生非常好的预测为180°和90°的域切换。
In this paper, existing domain-switching criteria are briefly reviewed and the predictions based on these domain-switching criteria are compared with the available experimental data for 180° and 90° domain switchings in lead lanthanum zirconate titanate (PLZT) and lead zirconate titanate (PZT), respectively. It is found that the predictions do not match the experimental results. Motivated by this observation, a new domain-switching criterion in terms of internal-energy density is proposed for combined mechanical and electrical loads. Based on consideration of the atomic structure of ferroelectric materials, it is recognized that 180° and 90° domain switchings result from different mechanisms and, thus, require different critical internal-energy densities for switching. The new criterion is found to yield very good predictions for both 180° and 90° domain switchings.