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首页> 外文期刊>The Journal of Chemical Physics >Non-linear dielectric signatures of entropy changes in liquids subject to time dependent electric fields
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Non-linear dielectric signatures of entropy changes in liquids subject to time dependent electric fields

机译：熵随时间变化的液体的非线性介电特征

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摘要

A model of non-linear dielectric polarization is studied in which the field induced entropy change is the source of polarization dependent retardation time constants. Numerical solutions for the susceptibilities of the system are obtained for parameters that represent the dynamic and thermodynamic behavior of glycerol. The calculations for high amplitude sinusoidal fields show a significant enhancement of the steady state loss for frequencies below that of the low field loss peak. Also at relatively low frequencies, the third harmonic susceptibility spectrum shows a "hump," i.e., a maximum, with an amplitude that increases with decreasing temperature. Both of these non-linear effects are consistent with experimental evidence. While such features have been used to conclude on a temperature dependent number of dynamically correlated particles, N-corr, the present result demonstrates that the third harmonic susceptibility display a peak with an amplitude that tracks the variation of the activation energy in a model that does not involve dynamical correlations or spatial scales. (C) 2016 AIP Publishing LLC.
机译：研究了非线性介电极化的模型，其中场感应的熵变化是极化相关的延迟时间常数的来源。对于代表甘油的动态和热力学行为的参数，获得了系统敏感性的数值解。对于低于低场损耗峰值的频率，高振幅正弦场的计算显示出稳态损耗的显着增强。同样在相对较低的频率下，三次谐波磁化率谱显示出“驼峰”，即最大值，其幅度随着温度的降低而增加。这两种非线性效应均与实验证据一致。尽管已使用这些特征来推断与温度相关的动态相关粒子N-corr的数量，但本结果表明，三次谐波磁化率显示出一个峰值，该峰值的幅度可跟踪模型中激活能量的变化。不涉及动力学相关性或空间尺度。 （C）2016 AIP出版有限责任公司。

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