The vibrational dynamics of GeO₂ at the glass transition: a Raman and Brillouin scattering study

F. Rossi (1) , Giacomo Baldi (2) , Silvia Caponi (3) , Roberto Dal Maschio (4) , Aldo Fontana (2) , Laura Orsingher (5) , Marco Zanatta (6)

1 Fisica
2 Physics
3 Physics
4 Dipartimento di Ingegneria dei Materiali e delle Tecnologie Industriali
5 Fisica
6 Dipartimento di Fisica [Povo]

New temperature-dependent Brillouin and Raman scattering experiments were performed on vitreous GeO₂ in the 10 K - 1200 K temperature range. We found that, while the sound velocity above room temperature slightly increases (2-3%), the frequency of the Boson peak maximum shows an unexpected behavior, decreasing of more than 15% when the temperature is increased. The results are interpreted in the framework of a phenomenological model.

Mots clés: Physical Sciences

F. Rossi, Giacomo Baldi, Silvia Caponi, Roberto Dal Maschio, Aldo Fontana, et al.. The vibrational dynamics of GeO₂ at the glass transition: a Raman and Brillouin scattering study. Philosophical Magazine, 2010, pp.1. ⟨10.1080/14786435.2010.533136⟩. ⟨hal-00653062⟩