Vibrational dynamics of permanently densified GeO2 glasses: Densification-induced changes in the boson peak

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Details zur Publikation

Autor(en): Orsingher L, Fontana A, Gilioli E, Carini Jr. G, Carini G, Tripodo G, Unruh T, Buchenau U
Zeitschrift: Journal of Chemical Physics
Verlag: AMER INST PHYSICS
Jahr der Veröffentlichung: 2010
Band: 132
Heftnummer: 12
ISSN: 0021-9606


Abstract


Vitreous GeO2, one of the main prototypes of strong glasses, was densified at several pressures up to 6 GPa, achieving more than 20% of densification. The density dependence of the vibrational density of states and of the low temperature properties of these glasses was investigated by means of inelastic neutron scattering and calorimetric measurements. With increasing density, both the boson peak and the bump in c(p)/T-3 versus T plot exhibit variations which are stronger than the elastic medium expectation. If one reduces the measured spectra to a common master curve, one finds that this is only possible for the densified samples; the first densification step has an additional effect, similar to other cases in the literature. Nevertheless, the existence of a master curve for the three densified samples proves that the total number of excess modes remains constant on further densification. The experimental data are discussed in the framework of different theoretical models.



FAU-Autoren / FAU-Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)


Autor(en) der externen Einrichtung(en)
Forschungszentrum Jülich GmbH (FZJ)
Università degli Studi di Trento


Zitierweisen

APA:
Orsingher, L., Fontana, A., Gilioli, E., Carini Jr., G., Carini, G., Tripodo, G.,... Buchenau, U. (2010). Vibrational dynamics of permanently densified GeO2 glasses: Densification-induced changes in the boson peak. Journal of Chemical Physics, 132(12). https://dx.doi.org/10.1063/1.3360039

MLA:
Orsingher, Laura, et al. "Vibrational dynamics of permanently densified GeO2 glasses: Densification-induced changes in the boson peak." Journal of Chemical Physics 132.12 (2010).

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