ABSTRACT

The $c_{66}^E$ values of PZT53/47 doped with 0.6% Gd₂O₃ show an anomalous behavior near 132°C as a consequence of a ferroelastic transition. A non-linear fit to the experimental data of the elastic stiffness variation $\mathrm{\Delta }{c}_{66}^E$ shows that it behaves according to the theoretical law describing pseudoproper ferroelastic transitions. Through Raman spectrum analysis, the frequency of soft mode A₁(1TO) has a minimum in the 132–136°C temperature interval associated with the coupling to the $S_6$ component of the deformation. The quantitative evaluation of the order parameter by hard mode spectroscopy ratified the occurrence of a ferroelastic phase transition. The behavior of both piezoelectric coefficients d₃₁ and the electromechanical coupling factor k₃₁ can be taken as evidence of the transition showing local maxima at 138°C as a consequence of the maximum deformation during the oscillations of the A₁(1TO) mode.

摘要

这 $C_{66}^{乙}$由于铁弹性转变，PZT53/47 掺杂 0.6% Gd ₂ O ₃的值在 132°C 附近表现出异常行为。弹性刚度变化实验数据的非线性拟合$\mathrm{\Delta }{C}_{66}^{乙}$表明它的行为符合描述赝固有铁弹性转变的理论规律。通过拉曼光谱分析，软模式 A ₁ (1TO)的频率在 132–136°C 温度区间内与耦合到${秒}_6$变形的组成部分。通过硬模光谱对有序参数的定量评估证实了铁弹性相变的发生。压电系数 d ₃₁和机电耦合因子 k ₃₁两者的行为都可以作为过渡的证据，显示在 138°C 处的局部最大值是 A ₁ (1TO) 模式振荡期间最大变形的结果。