Direct evidence for stiffness threshold in chalcogenide glasses

被引：278

作者：

Feng, XW

Bresser, WJ

Boolchand, P

机构：

[1] Department of Electrical and Computer Engineering and Computer Science, University of Cincinnati, Cincinnati, OH

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.78.4422

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Raman scattering in GexX1-x glasses, X = S or Se, reveals that the frequency of A(1) modes of corner-sharing Ge(X-1/2)(4) tetrahedra displays a discontinuous jump between x = 0.225 and x = 0.230, which coincides with a minimum in the nonreversing heat flow at the glass transition T-g established from modulated differential scanning calorimetry. These results constitute direct evidence for a stiffness threshold at a mean coordination [r](c) = 2.46(1), which is well described by mean-field constraint counting procedures.

引用

页码：4422 / 4425

页数：4

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