二苯甲酮的宽带介电谱：α弛豫，β弛豫和模式耦合理论
Broadband dielectric spectroscopy on benzophenone: alpha relaxation, beta relaxation, and mode coupling theory
摘要：
我们已经进行了详细的介电研究的玻璃形成二苯甲酮的弛豫动力学。我们的测量覆盖了0.1 Hz至120 GHz的宽频率范围，温度从远低于玻璃温度一直到小粘度液体的区域。关于α弛豫，这种材料可以被表征为具有相当高脆性的典型分子玻璃形成剂。的α松弛行为的预测的模式耦合理论的玻璃化转变的一个很好的协议。此外，在温度低于和附近的Tg，我们检测到一个很明显的β松弛的Johari-Goldstein型，随着温度的升高，发展成一个多余的翅膀。我们比较我们的结果与文献数据从光学克尔效应和去偏振光散射实验，其中一个多余的翼状功能观察到在1 - 100 GHz的区域。我们解决的问题，如果科尔-科尔峰，这是调用来描述的模式耦合理论的框架内的光学克尔效应数据，有任何关系的介电谱检测到的规范β弛豫。
英文摘要：
We have performed a detailed dielectric investigation of the relaxational dynamics of glass-forming benzophenone. Our measurements cover a broad frequency range of 0.1 Hz to 120 GHz and temperatures from far below the glass temperature well up into the region of the small-viscosity liquid. With respect to the alpha relaxation this material can be characterized as a typical molecular glass former with rather high fragility. A good agreement of the alpha relaxation behavior with the predictions of the mode coupling theory of the glass transition is stated. In addition, at temperatures below and in the vicinity of Tg we detect a well-pronounced beta relaxation of Johari-Goldstein type, which with increasing temperature develops into an excess wing. We compare our results to literature data from optical Kerr effect and depolarized light scattering experiments, where an excess-wing like feature was observed in the 1 - 100 GHz region. We address the question if the Cole-Cole peak, which was invoked to describe the optical Kerr effect data within the framework of the mode coupling theory, has any relation to the canonical beta relaxation detected by dielectric spectroscopy.
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