Meeting experimental challenges to physics of network glasses: Assessing the role of sample homogeneity

被引：41

作者：

Bhosle, S. ^{[1
]}

Gunasekera, K. ^{[1
]}

Chen, Ping ^{[1
]}

Boolchand, P. ^{[1
]}

Micoulaut, M. ^{[2
]}

Massobrio, C. ^{[3
]}

机构：

[1] Univ Cincinnati, Coll Engn & Appl Sci, Sch Elect & Comp Syst, Cincinnati, OH 45221 USA

[2] Univ Paris 06, Lab Phys Theor Mat Condensee, F-75252 Paris 05, France

[3] Inst Phys & Chim Mat Strasbourg, F-67034 Strasbourg 2, France

来源：

SOLID STATE COMMUNICATIONS | 2011年 / 151卷 / 24期

基金：

美国国家科学基金会;

关键词：

Chalcogenide glasses; Self-organization; Raman scattering; Modulated DSC; RIGIDITY TRANSITIONS; INTERMEDIATE PHASE; ELASTIC PROPERTIES; SE; FRAGILITY; ORDER;

D O I：

10.1016/j.ssc.2011.10.016

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We introduce a Raman profiling method to track homogenization of GexSe100-x melts in real time, and show that 2 g melts reacted at 950 degrees C in high vacuum homogenize in 168 h on a scale of 10 mu m. Homogenization of melts is precursive to self-organization of glasses. In the present glasses, compositional variation of Raman active corner-sharing mode frequency of GeSe4 units, molar volumes, and the enthalpy of relaxation at T-g, reveal the rigidity (x(c)(1) = 19.5(3)%) and the stress (x(c)(2) = 26.0(3)%) transitions to be rather sharp (Delta chi < 0.6%). These abrupt elastic phase transitions are in harmony with rigidity theory and have a direct bearing on the physics of glasses. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1851 / 1855

页数：5

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