Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study

We study the changes in the Raman optical vibrations of pure silica glass under high-pressure up to 4.3 GPa and room temperature, namely in the elastic domain. Several mechanical anomalies, as the decrease of bulk modulus between 0 and 2 GPa, have been revealed many years ago (P.W. Bridgmann, Am. J....

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Bibliographic Details
Published in:Journal of non-crystalline solids 2009-07, Vol.355 (18), p.1095-1098
Main Authors: Deschamps, T., Martinet, C., de Ligny, D., Champagnon, B.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Elasticity, elastic constants
Exact sciences and technology
Lattice dynamics
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Medium-range order
Optical spectroscopy
Physics
Pressure effects
Raman scattering
Raman spectroscopy
Silica
Thermal conductivity
Vibrational states in disordered systems
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Summary:We study the changes in the Raman optical vibrations of pure silica glass under high-pressure up to 4.3 GPa and room temperature, namely in the elastic domain. Several mechanical anomalies, as the decrease of bulk modulus between 0 and 2 GPa, have been revealed many years ago (P.W. Bridgmann, Am. J. Sci 10 (1925) 359), but no physical experiments have explained what happens at the atomic scale. Our experiments show that gradual structural reversible rearrangement from 0 to 2 GPa leads to a more flexible material, in good agreement with molecular dynamics (MD) simulations (L. Huang, J. Kieffer, Phys. Rev. B 69 (2004) 224203). Above 2 GPa, a fast homogenization occurs.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2009.01.045