Nonlinear electric field dependence of piezoresponse in epitaxial ferroelectric lead zirconate titanate thin films
Nonlinear electric field dependence of piezoresponse in epitaxial ferroelectric lead zirconate titanate thin films
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DOI：
10.1063/1.1610242
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发表时间：
2003-09
影响因子：
3.2
通讯作者：
Lang Chen;V. Nagarajan;R. Ramesh;A. Roytburd
中科院分区：
文献类型：
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作者：
Lang Chen;V. Nagarajan;R. Ramesh;A. Roytburd
用Landau-Devonshire唯象热力学理论解释了四方单畴PbZrxTi1-−_xO_3(PZT)的压电性与电场的关系。研究表明，块体和外延四方相PZT薄膜在外加电场的作用下，其逆压电系数都具有很强的非线性特性。定量地表征了外加电场对压电响应的可调性及其与薄膜/衬底失配和薄膜弹性柔量的关系。理论预测与压电响应扫描显微镜的实验结果吻合较好。由于PZT50/50(x=0.5)外延薄膜具有很大的可调性，因此有望用于未来的可调谐器件。
Landau–Devonshire-type phenomenological thermodynamic theory is employed to explain the electric field dependence of piezoelectric properties of tetragonal single domain PbZrxTi1−xO3 (PZT). The strong nonlinearity of the converse piezoelectric coefficient under a large external electric field is proved to be intrinsic both in bulk crystal and epitaxial tetragonal PZT thin films. The tunability of piezoelectric responses by an external electric field and its dependence on the film/substrate misfit and elastic compliance of thin films are characterized quantitatively. The theoretical predictions are in good agreement with the experimental results of piezoresponse scanning microscopy. Due to the large tunability of piezoresponse in it, PZT 50/50 (x=0.5) epitaxial film is a promising candidate for use in future tunable devices.