Abstract In SrxBa1−xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.

中文翻译：

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二次谐波产生技术探测的不同化学成分铌酸锶钡晶体中自发极化、声学和应变异常的温度依赖性

摘要 在 SrxBa1−xNb2O6 晶体 (x = 0.33、0.5、0.61 和 0.75) 中，比较了自发极化、应变、弹性模块和二次谐波生成 (SHG) 信号的温度依赖性。结果表明，SHG 描述了顺电相中极性纳米区域偶极矩的温度依赖性。在顺电相的相变附近，SHG 反映了相对较大且寿命较长的极性不对称区域的温度行为，如中间温度范围对这种非线性响应的温度依赖性的存在所表明的那样。