Effects of permanent densification on the vibrational density of states of vitreous silica |
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| Authors: | Marco Zanatta A Fontana F Rossi E Gilioli |
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| Institution: | 1. Dipartimento di Fisica, Università di Trento, Via Sommarive 14, I-38100 Povo, Trento, Italy;2. IPCF-CNR, UOS Roma c/o Università di Roma \"La Sapienza\", I-00185 Roma, Italy;3. IMEM-CNR, Area delle Scienze, I-43100 Parma, Italy |
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| Abstract: | We present a detailed Raman scattering study of the boson peak evolution in vitreous silica as a function of density, from the normal one up to ~ 22% of densification. We show that the distribution of low frequency modes in the boson peak range does not change as a function of density, at least until the densification process starts to modify the glassy network structure from a fourfold coordinated structure into a sixfold coordinated one. |
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