Observation of two elastic thresholds in Gex Asy Se1-x-y glasses

R. P. Wang, A. Smith, B. Luther-Davies, H. Kokkonen, I. Jackson

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    45 Citations (Scopus)

    Abstract

    We have prepared Gex Asy Se1-x-y glasses with mean coordination numbers (MCNs) from 2.2 to 2.86. Tg 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.

    Original languageEnglish
    Article number056109
    JournalJournal of Applied Physics
    Volume105
    Issue number5
    DOIs
    Publication statusPublished - 2009

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