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首页> 外文期刊>The Journal of Chemical Physics >Nonlinear permittivity spectra of supercooled ionic liquids: Observation of a 'hump' in the third-order permittivity spectra and comparison to double-well potential models
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Nonlinear permittivity spectra of supercooled ionic liquids: Observation of a 'hump' in the third-order permittivity spectra and comparison to double-well potential models

机译：过冷离子液体的非线性介质光谱：三阶介电常数观察“驼峰”并与双井潜在模型进行比较

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摘要

We have measured the third-order permittivity spectra epsilon(3)(3) of a monocationic and of a dicationic liquid close to the glass transition temperature by applying ac electric fields with large amplitudes up to 180 kV/cm. A peak ("hump") in the modulus of epsilon(3)(3) is observed for a mono-cationic liquid after subtraction of the dc contribution from the imaginary part of epsilon(3)(3). We show that the origin of this experimental "hump" is a peak in the imaginary part of epsilon(3)(3), with the peak height strongly increasing with decreasing temperature. Overall, the spectral shape of the third-order permittivity of both ionic liquids is similar to the predictions of a symmetric double well potential model, although this model does not predict a "hump" in the modulus. In contrast, an asymmetric double well potential model predicts a "hump," but the spectral shape of both the real and imaginary part of epsilon(3)(3) deviates significantly from the experimental spectra. These results show that not only the modulus of epsilon(3)(3) but also its phase is an important quantity when comparing experimental results with theoretical predictions. Published by AIP Publishing.
机译：通过施加具有大于180kV / cm的大幅度的AC电场，测量了单相和闭合玻璃化转变温度的三阶介收光谱εε（3）（3）。在从epsilon（3）（3）的虚拟部分减法后，对ε（3）（3）模量的峰值（“驼峰”）观察到单阳离子液体。我们表明，这种实验性“驼峰”的起源是ε（3）（3）的虚部中的峰值，峰值高度随着温度降低而强烈增加。总的来说，离子液体的三阶介电常数的光谱形状类似于对称双井电位模型的预测，尽管该模型不能预测模量中的“驼峰”。相反，不对称双井电位模型预测“驼峰”，但ε（3）（3）的真实和虚部（3）的光谱形状与实验光谱显着偏离。这些结果表明，不仅ε（3）（3）的模量，而且其相位也是在比较实验结果与理论上预测时的重要数量。通过AIP发布发布。

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