罗谢尔盐相变时的复合压电电光效应
Combined Piezoelectrooptic Effect in Rochelle Salt at the Phase Transition
摘要：
本文报道了罗谢尔盐晶体铁电-铁弹相变过程中压电电光效应的研究结果。通过测量机械应力作用下电光系数的变化和电场（或自发极化）作用下压电系数的变化，获得组合效应的系数。实验表明，这两个系数的值是相同的，由理论预测。得到了PEO复合效应系数随温度的变化关系。由于介电常数的反常，出现了它在相变时的反常行为。本文还证明，在罗谢尔盐晶体的相变中，压光系数的变化可以满意地解释为自发极化引起的线性和二次PEO效应的结果。
英文摘要：
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.
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