The Debye-Waller factor approaching the glass-transition temperature in phosphate glasses
Artikel i vetenskaplig tidskrift, 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
Författare
S. Caponi
Universita degli Studi di Trento
Sapienza, Università di Roma
A. Fontana
Universita degli Studi di Trento
Sapienza, Università di Roma
E. Fabiani
Institut Laue-Langevin
M. A. González
Institut Laue-Langevin
Lars Börjesson
Chalmers, Teknisk fysik, Kondenserade materiens fysik
Aleksandar Matic
Chalmers, Teknisk fysik, Kondenserade materiens fysik
C. Armellini
Istituto di Fotonica e Nanotecnologie (CNR-IFN)
Journal of Non-Crystalline Solids
0022-3093 (ISSN)
Vol. 352 42-49 SPEC. ISS. 4577-4582Ämneskategorier
Keramteknik
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1016/j.jnoncrysol.2006.01.118