Elastic anomalous behavior of silica glass under high-pressure: In-situ Raman study |
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Authors: | T Deschamps C Martinet D de Ligny B Champagnon |
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Institution: | Université de Lyon, Université Lyon-1, UMR5620 CNRS, Laboratoire de Physico-Chimie des Matériaux Luminescents, Domaine scientifique de la Doua, Bât. Kastler, 10 rue Ampère, 69662 Villeurbanne, France |
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Abstract: | 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. |
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