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Evidence of polyamorphic transitions during densified SiO2 glass annealing.
Cornet, Antoine; Martinet, Christine; Martinez, Valérie; de Ligny, Dominique.
Afiliação
  • Cornet A; Institut Lumière Matière, Univ Lyon, Université Claude Bernard Lyon 1, CNRS, F-69622 Villeurbanne, France.
  • Martinet C; Institut Lumière Matière, Univ Lyon, Université Claude Bernard Lyon 1, CNRS, F-69622 Villeurbanne, France.
  • Martinez V; Institut Lumière Matière, Univ Lyon, Université Claude Bernard Lyon 1, CNRS, F-69622 Villeurbanne, France.
  • de Ligny D; Department of Materials Science, Glass and Ceramics, University Erlangen-Nürnberg, Martensstra., D-91058 Erlangen, Germany.
J Chem Phys ; 151(16): 164502, 2019 Oct 28.
Article em En | MEDLINE | ID: mdl-31675866
In situ X-ray scattering monitoring is carried out during temperature annealing on different densified SiO2 glasses. Density fluctuations and intermediate range coherence from X-ray scattering (small-angle X-ray scattering) and diffraction (wide angle X-ray scattering) evidence a maximum in their evolution at the same relaxation time. These extrema confirm the existence of an intermediate transitory disordered state between the two more ordered high and low density amorphous states. We propose that the existence of this transitory state confirms the existence of two mega basins in the energy landscape and therefore an amorphous-amorphous transition. Including older Raman results, we show that this intermediate disorder state implies similar mechanisms at all length scales from a few angstroms to 5 nm.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article