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arXiv 1002.2081cond-mat.softcond-mat.mtrl-sci
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玻璃化转变时的Heat capacity

Heat capacity at the glass transition

Kostya Trachenko, Vadim Brazhkin

摘要:

玻璃化转变的一个基本问题是解释在玻璃化转变温度$T_g$下热容的跳跃,而不主张存在明显的固体玻璃相。这个问题在其他无序系统中也很常见,包括自旋玻璃。我们提出,如果将$T_g$定义为实验时间尺度上液体停止弛豫的温度,那么在$T_g$处热容的跃变是由于系统的弹性、振动和热性质的变化而必然发生的结果。在这张照片中,我们讨论了玻璃化转变的时间依赖性效应,并确定了三个不同的制度的松弛。我们的方法解释了广泛观察到的对数增加$T_g$与淬火速率和热容跳跃与液体脆性的相关性。

英文摘要:

A fundamental problem of glass transition is to explain the jump of heat capacity at the glass transition temperature $T_g$ without asserting the existence of a distinct solid glass phase. This problem is also common to other disordered systems, including spin glasses. We propose that if $T_g$ is defined as the temperature at which the liquid stops relaxing at the experimental time scale, the jump of heat capacity at $T_g$ follows as a necessary consequence due to the change of system's elastic, vibrational and thermal properties. In this picture, we discuss time-dependent effects of glass transition, and identify three distinct regimes of relaxation. Our approach explains widely observed logarithmic increase of $T_g$ with the quench rate and the correlation of heat capacity jump with liquid fragility.

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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