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Nonlinear phenomena in A(2)MX(4) type crystals with incommensurate phases

机译:具有不相称的A(2)MX(4)型晶体中的非线性现象

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Investigations of the nonlinear phenomena in A(2)MX(4) type crystals (A, organic cation or alkaline metal ion; M, metal ion; X, halogen ion) with incommensurate phases are very interesting from both a scientific and a practical point of view. In the crystals many interesting nonlinear phenomena are observed, e.g., thermal hysteresis of birefringence and absorption coefficient, piezooptic effect, electrooptic effect. Different anomalies (e.g., a discontinuity or change of sign of the birefringence coefficient, a distinct increase of the value of piezooptic and electrooptic coefficients) exist in the phase transition regions, They are especially distinct for a transition from the incommensurate phase to the commensurate phase. Some possibilities of detection and recognition of the existence of incommensurate phases by optical methods are suggested.
机译:从科学和实践角度出发,研究具有不相称相的A(2)MX(4)型晶体(A,有机阳离子或碱金属离子; M,金属离子; X,卤素离子)中的非线性现象非常有趣。看法。在晶体中观察到许多有趣的非线性现象,例如,双折射和吸收系数的热滞后,压电效应,电光效应。在相变区域中存在不同的异常现象(例如,双折射系数的不连续或符号变化,压光系数和电光系数的值明显增加),对于从不相称相到相称相的跃迁尤其明显。 。提出了通过光学方法检测和识别不相称相的可能性。

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