Non-linear piezoelectric response in lead zirconate-titanate (PZT) films
Non-linear piezoelectric response in lead zirconate-titanate (PZT) films
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DOI：
10.1080/00150190008008789
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发表时间：
2000-02
期刊：
影响因子：
0.8
通讯作者：
A. Kholkin
中科院分区：
文献类型：
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作者：
A. Kholkin
研究了交流电场对不同成分和厚度的PZT薄膜压电性能的影响。比较了PZT薄膜和块体陶瓷的非线性压电性能。结果表明，在亚微米厚度的薄膜中，非线性被强烈地抑制，而厚膜(7-8μm)表现出与“硬”压电陶瓷相当的较强的非线性。厚膜的非线性用经验公式d=dlin[1+(DNLE)α]来描述，α=1.2时。具有织构的四方相薄膜由于90°磁畴的贡献减小，表现出几乎与场无关的压电响应。压电系数服从对数型频率依赖关系。频率色散随交流电场的增大而增大，并与非180°磁畴的驰豫有关。这些结果为磁化壁面运动对PZT薄膜压电性能的贡献提供了直接的实验证据。
Abstract The effect of the ac electric field on piezoelectric properties is investigated in lead zirconate-titanate (PZT) films of various compositions and thicknesses. Non-linear piezoelectric properties of PZT films are compared to those of bulk ceramics. It is shown that non-linearity is strongly suppressed in thin films of the submicron thickness whereas thick films (7-8 μm) demonstrate relatively strong non-linearity comparable to that of “hard” PZT ceramics. Non-linearity in thick films is described by the empirical expression d=dlin[1+(dnlE)α] with α=1.2. Tetragonal films with texture show almost field-independent piezoelectric response due to the reduced contribution of 90° domains. The piezoelectric coefficient obeys logarithmic-type frequency dependence. The frequency dispersion increases with ac-field and can be related to the relaxation of non-180° domains. The results provide direct experimental evidence of the domain wall motion contribution to the piezoelectric properties of PZT films.