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Observation Of Two Elastic Thresholds In Ge_xas_yse_(1-x-y) Glasses

机译:Ge_xas_yse_(1-x-y)眼镜中两个弹性阈值的观察

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摘要

We have prepared Ge_xAs_ySe_(1-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 ≈ 2.45 and a minimum at MCN ≈ 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 ≈ 2.45 and the second at MCN ≈ 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.
机译:我们准备了Ge_xAs_ySe_(1-x-y)眼镜,其平均配位数(MCN)为2.2至2.86。发现T_g通常随MCN的增加而增加,而玻璃密度在MCN≈2.45时显示最大值,而在MCN≈2.65时显示最小值。通过超声脉冲干涉法测量的剪切和压缩波速度来估计玻璃的弹性模量。我们第一次同时观察到两个弹性转变阈值,第一个在MCN≈2.45,第二个在MCN≈2.65,这似乎与玻璃微结构的变化密切相关。两组具有相同的MCN≈2.4和2.64但组成不同的样品的弹性模量表明,化学成分也对弹性性能有影响。

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  • 来源
    《Journal of Applied Physics》 |2009年第5期|680-682|共3页
  • 作者单位

    Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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