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arXiv 1801.09272cond-mat.mtrl-scicond-mat.soft
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关于简单的阿耳忒弥斯定律在正常液态下的失效

On the breakdown of the simple Arrhenius law in the normal liquid state

Erik Thoms, Andrzej Grzybowski, Sebastian Pawlus, Marian Paluch

摘要:

通常的做法是根据Arrhenius定律讨论高于熔融温度的温度对玻璃形成物的分子动力学的影响。以典型的玻璃形成剂碳酸亚丙酯为例,使用介电谱测量直流电导率和结构弛豫时间,我们提供了实验证据,证明这种做法是不合理的。我们的结论得到支持,采用热力学密度标度和拐点的发生在等温动态测量的数据在升高的压力。此外,我们提出了一个更合适的方法来描述以上和以下的拐点的基础上修改MYEGA模型的动态。

英文摘要:

It is common practice to discuss the temperature effect on molecular dynamics of glass formers above the melting temperature in terms of the Arrhenius law. Using dielectric spectroscopy measurements of dc-conductivity and structural relaxation time on the example of the typical glass former propylene carbonate, we provide experimental evidence that this practice is not justified. Our conclusions are supported by employing thermodynamic density scaling and the occurrence of inflection points in isothermal dynamic data measured at elevated pressure. Additionally, we propose a more suitable approach to describe the dynamics both above and below the inflection point based upon a modified MYEGA model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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