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Unusual Fast Cation Conduction in the High-Temperature Phase of Lithium Sodium Sulfate

Published online by Cambridge University Press:  11 February 2011

H. Feldmann ,
R. E. Lechner  and
D. Wilmer
H. Feldmann
Affiliation:
Münster University, Institute of Physical Chemistry and Sonderforschungsbereich 458, Schlossplatz 4/7, 48149 Münster, Germany
R. E. Lechner
Affiliation:
Hahn-Meitner-Institut, Glienicker Str. 100, 14109 Berlin, Germany
D. Wilmer
Affiliation:
Münster University, Institute of Physical Chemistry and Sonderforschungsbereich 458, Schlossplatz 4/7, 48149 Münster, Germany
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Abstract

Lithium sodium sulfate (LiNaSO4) belongs to a group of simple inorganic salts exhibiting fast-cation conducting high-temperature phases with rotationally disordered anions. The analysis of a combination of quasielastic neutron scattering and high-frequency (10 MHz to 60 GHz) conductivity measurements in the high-temperature phase of LiNaSO4 reveals an unusual cation conduction mechanism: the Haven ratio, HR = D*/Dσ, turns out to be considerably larger than one. This behavior, to our knowledge detected for the first time in a typical fast ion conductor, can be traced back to a charge correlation factor clearly smaller than unity, indicating that charge transport is less effective than tracer transport in this material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE2.4
Copyright
Copyright © Materials Research Society 2003

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References

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