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Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2009

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

Résumé

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.

Dates et versions

hal-04549622 , version 1 (17-04-2024)

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T. Deschamps, C. Martinet, D. de Ligny, B. Champagnon. Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study. Journal of Non-Crystalline Solids, 2009, 355 (18-21), pp.1095-1098. ⟨10.1016/j.jnoncrysol.2009.01.045⟩. ⟨hal-04549622⟩
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