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arXiv 1505.04549cond-mat.mtrl-sci
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利用铁弹畴工程实现PZT陶瓷的面剪切压电系数d36

Realization of face-shear piezoelectric coefficient d36 in PZT ceramics via ferroelastic domain engineering

Hongchen Miao, Faxin Li

摘要:

压电面剪切(d36)模式可能是压电体中最有用的剪切模式,而目前这种模式只能存在于特定点群和切割方向的单晶中。由于压电陶瓷的横观各向同性对称性,理论上d36系数为零。在这项工作中,我们修改了极化PZT陶瓷的对称性从横向各向同性正交通过铁弹域切换沿“2”方向施加高横向应力,并保持应力几个小时。在去除压缩之后,发现压电系数d31比d32大得多。然后通过沿zxt+45度方向切割压缩样品,我们实现了d36系数高达206 pC/N,这是通过使用改进的d33仪测量的。在PZT陶瓷中获得的大的d36系数可能是非常有前途的面剪切模式谐振器和剪切水平(SH)波的产生在无损检测。

英文摘要:

The piezoelectric face-shear (d36) mode may be the most useful shear mode in piezoelectrics, while currently this mode can only exist in single crystals of specific point groups and cut directions. Theoretically the d36 coefficient vanishes in piezoelectric ceramics because of its transversally isotropic symmetry . In this work, we modified the symmetry of poled PZT ceramics from transversally isotropic to orthogonal through ferroelastic domain switching by applying a high lateral stress along the "2" direction and holding the stress for several hours. After removing the compression, the piezoelectric coefficient d31 is found much larger than d32. Then by cutting the compressed sample along the zxt+45 deg direction, we realized d36 coefficients up to 206 pC/N which is measured by using a modified d33 meter. The obtained large d36 coefficients in PZT ceramics could be very promising for face-shear mode resonators and shear horizontal (SH) wave generation in nondestructive testing.

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