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Rietveld Neutron Powder Profile Analysis and Electrical Conductivity of the Fast Silver-Ion Conductor (LaO)AgS

Published online by Cambridge University Press:  10 February 2011

Dirk Wilmer ,
Bernhardt J. Wuensch  and
James D. Jorgensen
Dirk Wilmer
Affiliation:
University of Münster, Institute of Physical Chemistry, Münster, Germany
Bernhardt J. Wuensch
Affiliation:
Department of Materials Science and Engineering, MIT, Cambridge, MA
James D. Jorgensen
Affiliation:
IPNS, Argonne National Laboratory, Argonne, IL
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Abstract

Lanthanum silver oxysulfide, (LaO)AgS, exhibits a predominantly ionic conductivity of 10−3 to 10−1 S/cm between 300 K and 770 K. The tetragonal structure consists of alternating (LaO) and (AgS) sheets, their sequence being O-La-S-Ag-S-La-O. The structure suggests that ionic transport arises from migration of silver ions within the AgS layers analogous to sodium ion transport in Na-β-alumina.

Neutron powder diffraction data measured at five temperatures between 300 K and 770 K are analysed using the Rietveld method to determine the distribution and thermal vibration parameters of the mobile silver ions. The structural investigation is accompanied by measurements of the total conductivity in the same temperature range in order to resolve severe discrepancies in the literature data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 455
Copyright
Copyright © Materials Research Society 1999

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References

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