Characterization of the glass transition in vitreous silica by temperature scanning small-angle X-ray scattering Auteur(s): Brüning Ralf, Levelut C., Faivre A., Le Parc R., Simon J., Bley Françoise, Hazemann Jean-Louis (Article) Publié: Europhysics Letters (Epl), vol. 70 p.211 (2005) Texte intégral en Openaccess : Ref HAL: hal-00004494_v1 Ref Arxiv: cond-mat/0503439 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: The temperature dependence of the x-ray scattering in the region below the first sharp diffraction peak was measured for silica glasses with low and high OH content (GE-124 and Corning 7980). Data were obtained upon scanning the temperature at 10, 40 and 80 K/min between 400 K and 1820 K. The measurements resolve, for the first time, the hysteresis between heating and cooling through the glass transition for silica glass, and the data have a better signal to noise ratio than previous light scattering and differential thermal analysis data. For the glass with the higher hydroxyl concentration the glass transition is broader and at a lower temperature. Fits of the data to the Adam-Gibbs-Fulcher equation provide updated kinetic parameters for this very strong glass. The temperature derivative of the observed X-ray scattering matches that of light scattering to within 14%. Commentaires: EurophysicsLetters, in press |