Stiffness transitions in SixSe1-x glasses from Raman scattering and temperature-modulated differential scanning calorimetry

被引：180

作者：

Selvanathan, D ^{[1
]}

Bresser, WJ ^{[1
]}

Boolchand, P ^{[1
]}

机构：

[1] Univ Cincinnati, Dept ECECS, Cincinnati, OH 45221 USA

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.61.15061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature-modulated differential scanning calorimetry (MDSC) measurements on SixSe1-x glasses show glass transitions to be thermally reversing in character in the composition window 0.20<x<0.27. Raman scattering shows a trimodal distribution of vibrational modes, identified with corner-sharing (CS), edge-sharing (ES), and Se-chain modes (CM). In the floppy region, 0<x<0.19, these modes are symmetric and are characteristic of a random network. In the transition region, 0.20<x<0.27, the ES and CM split into doublets suggesting appearance of extended range structural correlations. In the percolatively rigid region, x > 0.27, the CS mode in addition to the ES and CM also splits into a doublet indicating growth of substantial medium range structure. The large compositional width (0.20<x<0.27) associated with Raman elastic thresholds coincides with the thermally reversing window from MDSC.

引用

页码：15061 / 15076

页数：16

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