Network rigidity in GeSe2 glass at high pressure |
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Authors: | Antao Sytle M Benmore Chris J Li Baosheng Wang Liping Bychkov Evgeny Parise John B |
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Affiliation: | Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA. sytle.antao@anl.gov |
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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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