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A Study of Ag+-Ion Dynamics in Ag2S-GeS2 Glasses

Published online by Cambridge University Press:  28 February 2011

A.P. Owens ,
A. Pradel ,
M. Ribes  and
S.R. Elliott
A.P. Owens
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, U.K.
A. Pradel
Affiliation:
Laboratoire de Physico-chimie des Matériaux, Université des Sciences et Techniques du Languedoc, Montpellier, France
M. Ribes
Affiliation:
Laboratoire de Physico-chimie des Matériaux, Université des Sciences et Techniques du Languedoc, Montpellier, France
S.R. Elliott
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, U.K.
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Abstract

A quasi-elastic neutron scattering (QENS) study of the Ag+-ion diffusion coefficient, D, in glassy (Ag2S)0.5 (GeS2)0.5 has been performed. The results indicate that the magnitude of D is larger, and its activation energy is smaller, than the corresponding quantities inferred from measurements of the d.c. ionic conductivity. This behaviour is ascribed to the fact that QENS probes diffusive processes occurring at very high frequencies (∼1011Hz) where the magnitude of the a.c. conductivity is correspondingly larger, and its temperature dependence is less, than that of the d.c. conductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 621
Copyright
Copyright © Materials Research Society 1991

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