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  • Title: Network rigidity in GeSe2 glass at high pressure.
    Author: Antao SM, Benmore CJ, Li B, Wang L, Bychkov E, Parise JB.
    Journal: Phys Rev Lett; 2008 Mar 21; 100(11):115501. PubMed ID: 18517792.
    Abstract:
    Acoustic measurements using synchrotron radiation have been performed on glassy GeSe2 up to pressures of 9.6 GPa. A minimum observed in the shear-wave velocity, associated anomalous behavior in Poisson's ratio, and discontinuities in elastic moduli at 4 GPa are indicative of a gradual structural transition in the glass. This is attributed to a network rigidity minimum originating from a competition between two densification mechanisms. At pressures up to 3 GPa, a conversion from edge- to corner-sharing tetrahedra results in a more flexible network. This is contrasted by a gradual increase in coordination number with pressure, which leads to an overall stiffening of the glass.
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