标题： 罗谢尔盐相变时的联合压电光弹效应 显示英文标题

标题： Combined Piezoelectrooptic Effect in Rochelle Salt at the Phase Transition

摘要： 展示了关于罗谢尔盐晶体铁电－铁弹相变过程中压电光效应（PEO效应）的研究结果。 通过机械应力作用下电光系数的变化和电场（或自发极化）作用下压光系数的变化测量得到了联合效应的系数。 实验表明这两个系数的值与理论预测的一致。 获得了联合PEO效应系数的温度依赖关系。 其在相变时的反常行为是由于介电常数的反常引起的。 还证明了罗谢尔盐晶体相变时压光系数的变化可以用自发极化诱导的线性和二次PEO效应来满意地解释。 显示英文摘要

摘要： The results of study of piezoelectrooptic (PEO) effect in the course of ferroelectric-ferroelastic phase transition in Rochelle salt crystals are presented. The coefficient of the combined effect is obtained from measurements of the changes in the electrooptic coefficients under the action of mechanical stress and the changes in the piezooptic coefficients under the action of electric field (or spontaneous polarization). It is shown experimentally that the values of both coefficients are the same, as predicted by the theory. The temperature dependence of the coefficient of combined PEO effect is obtained. Its anomalous behaviour at the phase transition appears due to the dielectric permitivity anomaly. It is also demonstrated that the change in the piezooptic coefficients at the phase transition in Rochelle salt crystals may be satisfactorily explained as a result of linear and quadratic PEO effect induced by spontaneous polarization.