Abstract
This paper reports an investigation into the fundamental temperature stability of piezoelectric ceramics through thermal aging and thermal shock tests. The dependence of piezoelectricity on thermal aging and thermal shock of low Qm and high Qm materials was clarified. The surface charges generated by the thermal shock caused depolarization of the ceramic elements. In particular, it was found that space charges promoted depolarization in the high Qm materials. A resistor inserted in parallel with the element for the thermal shock test improved piezoelectricity by causing quick relaxation of the induced charges.
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