arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.02799cond-mat.mtrl-sci
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铁电体中的压电软化:铁电与反铁电PbZr $_{1-x}$ Ti $_{x}$ O $_{3}$

Piezoelectric softening in ferroelectrics: ferroelectric versus antiferroelectric PbZr$_{1-x}$Ti$_{x}$O$_{3}$

F. Cordero, F. Craciun, F. Trequattrini, C. Galassi

摘要:

在Landau理论的框架下,对铁电(FE)相变相关的弹性异常的传统推导是与压电本构关系相结合的,而不是明确地用自由能的FE部分的明确表达式来进行。以这种方式,它示出的FE相内的软化是电致伸缩,因此压电起源。当振动期间形成的压电电荷伴随着去极化场时,例如在布里渊散射实验中,这种压电软化可以被更好地已知的压电硬化所抵消。作为实验验证,我们提出了新的测量富锆PZT,其中FE相转变成反铁电冷却或掺杂与La,和现有的测量FE PZT与低频和布里渊散射实验的比较。

英文摘要:

The traditional derivation of the elastic anomalies associated with ferroelectric (FE) phase transitions in the framework of the Landau theory is combined with the piezoelectric constitutive relations instead of being explicitly carried out with a definite expression of the FE part of the free energy. In this manner it is shown that the softening within the FE phase is of electrostrictive and hence piezoelectric origin. Such a piezoelectric softening may be canceled by the better known piezoelectric stiffening, when the piezoelectric charges formed during the vibration are accompanied by the depolarization field, as for example in Brillouin scattering experiments. As experimental validation, we present new measurements on Zr-rich PZT, where the FE phase transforms into antiferroelectric on cooling or doping with La, and a comparison of existing measurements made on FE PZT with low frequency and Brillouin scattering experiments.

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