Incipient phase separation in Ag/Ge/Se glasses: clustering of Ag atoms

Citation
H. Iyetomi et al., Incipient phase separation in Ag/Ge/Se glasses: clustering of Ag atoms, J NON-CRYST, 262(1-3), 2000, pp. 135-142
Citations number
28
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NON-CRYSTALLINE SOLIDS
ISSN journal
00223093 → ACNP
Volume
262
Issue
1-3
Year of publication
2000
Pages
135 - 142
Database
ISI
SICI code
0022-3093(200002)262:1-3<135:IPSIAG>2.0.ZU;2-I
Abstract
Structural and dynamical properties of three-component chalcogenide glasses , Ag/Ge/Se, are studied using the molecular dynamics (MD) method. Effective potentials for GeSe2 and Ag2Se, which have already been well characterized , are combined to describe the interatomic interactions in the ternary syst em. The MD results for bond lengths, the static structure factor, and the v ibrational density of states are in good agreement with neutron-scattering results. Our results elucidate the role played by silver ions as network mo difiers in glass-forming GeSe2 with the medium-range correlations. Upon coo ling we observe clustering of Ag atoms which indicates a tendency toward ph ase separation. (C) 2000 Published by Elsevier Science B.V. All rights rese rved.