Observation of two elastic thresholds in GexAsySe1-x-y glasses

被引：40
|
作者：
Wang, R. P. [1 ]
Smith, A. [1 ]
Luther-Davies, B. [1 ]
Kokkonen, H. [2 ]
Jackson, I. [2 ]
机构：
[1] Australian Natl Univ, Res Sch Phys & Engn, Laser Phys Ctr, Ctr Ultrahigh Bandwidth Devices Opt Syst CUDOS, Canberra, ACT 0200, Australia
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
来源：
JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 05期
基金：
澳大利亚研究理事会;
关键词：
chalcogenide glasses; elastic moduli; elastic waves; germanium compounds; glass transition; ultrasonic applications; RIGIDITY; TRANSITIONS; AS2SE3; PHASE;
D O I：
10.1063/1.3079806
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have prepared GexAsySe1-x-y glasses with mean coordination numbers (MCNs) from 2.2 to 2.86. T-g was found to generally increase with increasing MCN while the glass density showed a maximum at MCN approximate to 2.45 and a minimum at MCN approximate to 2.65. The elastic moduli of the glasses were estimated from the shear and compressional wave velocities measured by ultrasonic pulse interferometry. For the first time we simultaneously observed two elastic transition thresholds, the first at MCN approximate to 2.45 and the second at MCN approximate to 2.65, which appear closely correlated with changes in the glass microstructure. The elastic moduli of two groups of samples with the same MCN=2.4 and 2.64 but different compositions suggest that the chemical compositions also have an influence on the elastic properties.
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页数：3
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