Dielectric nonlinearity of stack piezoelectric actuator under the combined uniaxial mechanical and electric loads
Dielectric nonlinearity of stack piezoelectric actuator under the combined uniaxial mechanical and electric loads
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DOI：
10.1063/1.2999441
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发表时间：
2008-10
影响因子：
3.2
通讯作者：
Gang Yang;Zhenxing Yue;Ye Ji;Long-tu Li
中科院分区：
文献类型：
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作者：
Gang Yang;Zhenxing Yue;Ye Ji;Long-tu Li
研究了叠层锆钛酸铅（PZT）压电驱动器在单轴机械和电载荷联合作用下的介电非线性。在中间电场区域（瑞利区域）中，瑞利系数在小于50 MPa时增加，超过该值则下降。同样，由P-E滞后回线识别的介电非线性，通过介电测量和Rayleigh定律拟合揭示，也显示出在小于50 MPa时初始增加，并且当应力高于50 MPa时随后减小。在高电场区，介电非线性随应力的增加而持续下降，导致瑞利区和高电场区之间的边界变得模糊。这些结果可以解释为施加的应力对铁电畴相关贡献的介电响应的影响，这是非常重要的叠层压电致动器的实际应用。
The dielectric nonlinearity of stack lead zirconium titanate (PZT) piezoelectric actuator was investigated under the combined uniaxial mechanical and electric loads. In the intermediate electric field region (Rayleigh region), the Rayleigh coefficient increases at less than 50 MPa, beyond which it declines. Similarly, the dielectric nonlinearity identified by P-E hysteresis loop, revealed by both the dielectric measurement and the Rayleigh law fitting, also shows an initial increase at less than 50 MPa and a subsequent decrease when stress is above 50 MPa. In the high electric field region, the dielectric nonlinearity declined continuously with increasing stress, which leads to a fact that a boundary between the Rayleigh region and high field region becomes smeared. These results could be interpreted as the influences of the applied stress on ferroelectric domain-related contributions to dielectric response, which is very important to the practical application of stack piezoelectric actuators.