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首页> 外文期刊>Crystallography reports >Piezo-optic properties of incommensurately modulated K_2ZnCl_ 4 crystals
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Piezo-optic properties of incommensurately modulated K_2ZnCl_ 4 crystals

机译：非同等调制的K_2ZnCl_ 4晶体的压电特性

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摘要

The effect that uniaxial pressures along the principal crystallophysical directions have on the dispersion and temperature dependences of the birefringence in incommensurate K_2ZnCl_4 crystals has been investigated in a wide temperature range. This parameter has been established to be fairly sensitive to uniaxial pressures. The spectral and temperature dependences of combined piezo-optic coefficients are analyzed. Significant anomalies of these coefficients are found at the incommensurate-commensurate phase transition. They are due to the change in the induced birefringence that results from spontaneous polarization and to the significant effect of uniaxial stress on the soliton structure of the crystal. The contributions that the electrooptic effect, the elasto-optic effect, and the order parameter make to the spontaneous changes in the piezooptic coefficients are separated.
机译：已在较宽的温度范围内研究了沿主要晶体物理方向的单轴压力对不对称K_2ZnCl_4晶体中双折射的色散和温度依赖性的影响。已经确定该参数对单轴压力相当敏感。分析了组合的压电系数的光谱和温度依赖性。在不相称相称的相变中发现这些系数的显着异常。它们是由于自发极化引起的感应双折射的变化以及单轴应力对晶体的孤子结构的重大影响。电光效应，弹性光效应和阶数参数对压电系数自发变化的贡献是分开的。

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