Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 211 - 217
Section Condensed matter: structural, mechanical and thermal properties
Published online 16 March 2005
Europhys. Lett., 70 (2), pp. 211-217 (2005)
DOI: 10.1209/epl/i2004-10481-1

Characterization of the glass transition in vitreous silica by temperature scanning small-angle X-ray scattering

R. Brüning1, C. Levelut2, A. Faivre2, R. LeParc2, J.-P. Simon3, F. Bley3 and J.-L. Hazemann4

1  Physics Department, Mount Allison University - 67 York Street Sackville (NB), Canada E4L 1E6
2  Laboratoire des Colloïdes, Verres et Nanomatériaux UMR 5587 CNRS-Université Montpellier II cc 69, 34095 Montpellier Cedex, France
3  LTPCM-ENSEEG-INPG, UMR-CNRS 5614 BP 75, 38402 St. Martin d'Hères Cedex, France
4  Laboratoire de Cristallographie, UPR 5031, CNRS BP 166, 38042 Grenoble, France

received 28 October 2004; accepted in final form 28 February 2005
published online 16 March 2005

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 $\chem{OH}$ content (GE-124 and Corning 7980). Data were obtained upon scanning the temperature at 10, 40 and 80 $\un{K/min}$ between 400$\un{K}$ and 1820$\un{K}$. 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%.

64.70.Pf - Glass transitions.
42.70.Ce - Glasses, quartz.
61.10.Eq - X-ray scattering (including small-angle scattering).

© EDP Sciences 2005