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arXiv 0809.1603cond-mat.dis-nn
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用连续缺陷理论描述过冷液体中的$α$ -和$β$ -弛豫

A description of $α$- and $β$-relaxation in supercooled liquids within the framework of the continuous theory of defects

M. G. Vasin

摘要:

利用连续缺陷理论,用键取向序缺陷态理论描述了过冷液体。结果表明,局域取向序的产生导致了理论初始SO(3)对称性的破坏,从而使线性缺陷的塑性形变场变为阿贝尔场。在准定态绝热近似下,导出了线位错和向错张量势的表达式。结果表明,过冷液体的$α$ -弛豫和$β$ -弛豫可以分别描述为向错和位错子系统的弛豫过程。提出用向错拓扑矩作为描述玻璃化转变的序参量。

英文摘要:

Supercooled liquid is described in terms of the theory of defected states of bond orientational order using the continuous theory of defects. It is shown that the initiation of a local orientation order leads to the breakdown of the initial SO(3) symmetry of the theory, as a result the plastic deformation fields of the linear defects become Abelian. The expressions for linear dislocation and disclination tensor potentials are derived within the framework of the quasistationary adiabatic approximation. It is shown that $α$-relaxation and $β$-relaxation of supercooled liquid can be described as relaxation processes in the disclination and dislocation subsystems accordingly. Disclination topological moment is proposed to use as an order parameter at the description of glass transition.

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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