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Structural Evolution and Medium Range Order in Permanently Densified Vitreous SiO2 (Articolo in rivista)

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Structural Evolution and Medium Range Order in Permanently Densified Vitreous SiO2 (Articolo in rivista) (literal)

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Alternative label

Zanatta, M.; Baldi, G.; Brusa, R. S.; Egger, W.; Fontana, A.; Gilioli, E.; Mariazzi, S.; Monaco, G.; Ravelli, L.; Sacchetti, F. (2014)
Structural Evolution and Medium Range Order in Permanently Densified Vitreous SiO2
in Physical review letters (Print); The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
(literal)

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Zanatta, M.; Baldi, G.; Brusa, R. S.; Egger, W.; Fontana, A.; Gilioli, E.; Mariazzi, S.; Monaco, G.; Ravelli, L.; Sacchetti, F. (literal)

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1 Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy; 2 IMEM-CNR, I-43124 Parma, Italy; 3 Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy; 4 Institut für Angewandte Physik und Messtechnik, Universität der Bundeswehr München, D-85577 Neubiberg, Germany;5 IOM-CNR c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy (literal)

Titolo

Structural Evolution and Medium Range Order in Permanently Densified Vitreous SiO2 (literal)

Abstract

Positron annihilation lifetime spectroscopy is employed to measure the size of the interstitial void spaces characterizing the structure of a set of permanently densified SiO2 glasses. The average volume of the voids is markedly affected by the densification process and linearly shrinks by almost an order of magnitude after a relative density variation of 22%. In addition, x-ray diffraction shows that this change of density does not modify appreciably the short range order, which remains organized in SiO4 tetrahedra. These results strongly suggest a porous medium description for v-SiO2 glasses where the compressibility and the medium range order are dominated by the density variation of the voids volume up to densities close to that of alpha-quartz. (literal)

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