The Debye-Waller factor approaching the glass-transition temperature in phosphate glasses
Journal article, 2006
The temperature dependence of the mean square displacement, 〈u2〉, calculated by elastic neutron scattering for two phosphate glasses, (AgI)x(AgPO3)1-x with x = 0.3, 0.55, is analysed. The studied samples are probed in a wide range of temperatures going from a few tens of K up to the glass transition temperature and well into the undercooled liquid state. In the low temperature regime a solid like behaviour appears, showing a linear temperature dependence of the Debye-Waller factor, while around Tg the onset of a pronounced increase of 〈u2〉 is observed. The temperature dependence of the normalized elastic intensity and the drawn out Debye-Waller factor are fitted and analyzed by the theoretical previsions of Mode Coupling Theory finding a good agreement. © 2006 Elsevier B.V. All rights reserved.
Structural relaxation
Neutron diffraction/scattering
Glass transition
Phosphates
Author
S. Caponi
University of Trento
Sapienza University of Rome
A. Fontana
University of Trento
Sapienza University of Rome
E. Fabiani
Institut Laue-Langevin
M. A. González
Institut Laue-Langevin
Lars Börjesson
Chalmers, Applied Physics, Condensed Matter Physics
Aleksandar Matic
Chalmers, Applied Physics, Condensed Matter Physics
C. Armellini
Institute for Photonics and Nanotechnologies
Journal of Non-Crystalline Solids
0022-3093 (ISSN)
Vol. 352 42-49 SPEC. ISS. 4577-4582Subject Categories
Ceramics
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1016/j.jnoncrysol.2006.01.118