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Philosophical Magazine Volume 91, 2011 - Issue 13-15: Twelfth International Workshop on Complex Systems: Andalo (Trento) Italy. 15–18 March 2010
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Original Articles

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

F. Rossi Dipartimento di Fisica, Università di Trento, I-38050 Povo, Trento, ItalyCorrespondence[email protected]
,
G. Baldi European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
,
S. Caponi Dipartimento di Fisica, Università di Trento, I-38050 Povo, Trento, Italy; IOM-CNR, c/o Universit di Perugia, I-06123 Perugia, Italy
,
R. Dal Maschio Dipartimento di Ingegneria dei Materiali, Università di Trento, I-38050 Mesiano, Trento, Italy
,
A. Fontana Dipartimento di Fisica, Università di Trento, I-38050 Povo, Trento, Italy; IOM-CNR, c/o Universit di Perugia, I-06123 Perugia, Italy
,
L. Orsingher Dipartimento di Fisica, Università di Trento, I-38050 Povo, Trento, Italy
&
M. Zanatta Dipartimento di Fisica, Università di Trento, I-38050 Povo, Trento, Italy
 show all
Pages 1910-1916 | Received 09 Jun 2010, Accepted 12 Oct 2010, Published online: 17 Dec 2010
 
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Abstract

New temperature-dependent Brillouin and Raman scattering experiments were performed on vitreous GeO2 in the 10–1200 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 unexpected behavior, decreasing by more than 15% when the temperature is increased. The results are interpreted in the framework of a phenomenological model.

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