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• W3136821098 abstract "In glasses, atomic disorder combined with atomic connectivity makes understanding of the nature of the vibrations much more complex than in crystals or molecules. With a simple model, however, it is possible to show how disorder generates quasi-local modes on optic branches as well as on acoustic branches at low frequency. The latter modes, possibly hybridizing with low-lying optic modes in real glasses, lead to the excess, low-frequency excitations known as “boson-peak modes,” which are lacking in crystals. The spatially quasi-localized vibrations also explain anomalies in thermal conductivity and the end of the acoustic branches, two other specific features of glasses. Together with the quasi-localization of the modes at the nanometric scale, structural disorder lifts the crystalline or molecular spectroscopic selection rules and makes interpretation of experiments difficult. Nevertheless, vibrations in simple glasses such as vitreous silica or vitreous boron oxide are nowadays rather well described. But a comprehensive understanding of the boson-peak modes remains a highly debated issue as illustrated by three archetypal glass systems, vitreous SiO2 and B2O3 and amorphous silicon." @default.
• W3136821098 created "2021-03-29" @default.
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• W3136821098 date "2021-02-01" @default.
• W3136821098 modified "2023-09-24" @default.
• W3136821098 title "Atomic Vibrations in Glasses" @default.
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• W3136821098 doi "https://doi.org/10.1002/9781118801017.ch3.4" @default.
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