3445 圧電セラミックスの共振周波数による材料特性変化の検討(S15-3 機能材料,S15 先端材料システムの強度・機能評価とメゾメカニックス)

抄録

In the present paper, lead zirconate titanate (PZT) and lead zirconate piezoelectric ceramics were subjected to both high electric field (which is higher than the coercive electric field) with low frequency and low electric field with high frequency (which is the resonance frequency). After applying certain electric field systematically, resonance and anti-resonance frequencies and an electrostatic capacity were measured by means of an impedance analyzer, and an electromechanical coupling coefficient, a dielectric constant, a Young's modulus and a piezoelectric constant were evaluated from them. Then variation of the material properties in process of time was investigated experimentally, and the dependence of the variation of the properties on applied electric field was elucidated.