INFLUENCE OF DISORDER ON VISCOSITY OF UNDERCOOLED MELTS

被引：61
|
作者：
AVRAMOV, I
机构：
[1] Institute of Physical Chemistry, Bulgarian Academy of Science
来源：
JOURNAL OF CHEMICAL PHYSICS | 1991年 / 95卷 / 06期
关键词：
D O I：
10.1063/1.461834
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The influence of disorder on shear viscosity of undercooled melts is described by the formula eta = eta-o.exp(theta/T)a. It is shown that this expression reproduces the existing experimental data with a reasonable accuracy for a broad range of substances of various nature (silicates, borates, germanates, phosphates, Se, glucose, glycerin, As2Se3, etc.). Angell and Sichina [Ann. NY Acad. Sci. 279, 53 (1976)] distinguish between "strong" and "fragile" liquids on the basis of their heat capacity. The present model provides a physical ground for such classification. Also the isostructural viscosity of glasses is easily described. The present approach gives a natural explanation to the empirical rule of Bimen and Kauzmann.
引用
收藏
页码：4439 / 4443
页数：5
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