Nature of the Boson peak of silica glasses from hyper-Raman scattering
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説明
Abstract Hyper-Raman scattering from the Boson peak has been performed in vitreous silica and in a silica-based lead glass. A comparison with Raman scattering and infrared measurements suggests that in v-SiO 2 the low- ω excitations are associated with rotational motions of SiO 4 tetrahedra. These modes dominate the vibrational density of states in that frequency range. In the lead glass, despite a strong modification of the SiO 4 network as compared to pure silica, the results indicate that the low-frequency density of states might also be dominated by hyper-Raman active modes.
収録刊行物
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- Journal of Non-Crystalline Solids
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Journal of Non-Crystalline Solids 307-310 87-91, 2002-09-01
Elsevier BV