A phenomenological theory of ultrasonic attenuation in ferroelectrics
A phenomenological theory of ultrasonic attenuation in ferroelectrics
复制标题
铁电体中超声波衰减的唯象理论
DOI：
10.1007/bf01725129
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
V. Dvořák
中科院分区：
文献类型：
--
作者：
V. Dvořák
在流体力学近似下，计算了居里温度以上非压电铁电晶体中超声波的复阻尼常数。超声波与极化波的相互作用用电致伸缩常数表示。弛豫型和位移型铁电体都以统一的方式处理。详细研究了两种典型铁电体的声衰减常数和频移随频率和温度的变化关系。
The complex damping constant of an ultrasonic wave in a ferroelectric crystal which is non-piezoelectric above the Curie temperature was calculated in the hydrodynamic approximation. The interaction of the ultrasound with polarization waves is expressed in terms of electrostrictive constants. Ferroelectrics both of the relaxation and displacive type are treated in an unified way. The frequency and temperature dependence of the sound attenuation constant and frequency shift was studied in detail for two typical representatives of ferroelectrics, i.e. barium titanate and tri-glycine sulphate.