title: In situ high pressure and high temperature Raman studies of (1-x)SiO(2)xGeO(2) glasses.
abstract: The structure of glasses in the binary system SiO(2)-GeO(2) has been studied by Raman spectroscopy. Our results are consistent with mixing of SiO(2) and GeO(2) tetrahedra. The changes induced by temperature and by pressure on the structure are monitored by in situ measurements on the same mixed glasses. Anomalous temperature dependences are observed not only for SiO(2) glass and GeO(2) glass but also for mixed glasses. Particular attention is focused on the pressure densification mechanism in mixed glasses. Via the pressure dependence of the width of the main Raman band, we show that the compression mechanism in mixed glasses is intermediate between that of the end members.
authors.affiliation: Laboratoire des Colloides Verres et Nanomatériaux, UMR CNRS-UM2 5587, Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France.
authors.forename: R
authors.initials: R
authors.lastname: Le Parc
authors.forename: V
authors.initials: V
authors.lastname: Ranieri
authors.forename: J
authors.initials: J
authors.lastname: Haines
authors.forename: M
authors.initials: M
authors.lastname: Cambon
authors.forename: O
authors.initials: O
authors.lastname: Cambon
authors.forename: C
authors.initials: C
authors.lastname: Levelut
authors.forename: S
authors.initials: S
authors.lastname: Clément