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Influence of Precursor Chemistry on Phase Evolution and Stability Range in the Potassium-Beta Alumina System

Published online by Cambridge University Press:  15 February 2011

Günter W. Schäfer ,
Arnoud P. de Kroon  and
Fritz Aldinger
Günter W. Schäfer
Affiliation:
Max-Planck-lnstitute for Metals Research, Institute for Materials Science, Powder Metallurgy Laboratory, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Arnoud P. de Kroon
Affiliation:
Max-Planck-lnstitute for Metals Research, Institute for Materials Science, Powder Metallurgy Laboratory, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Fritz Aldinger
Affiliation:
Max-Planck-lnstitute for Metals Research, Institute for Materials Science, Powder Metallurgy Laboratory, Heisenbergstrasse 5, 70569 Stuttgart, Germany
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Abstract

The beta alumina structures are known for their high ionic mobility within the lattice. This lead to the development of the Na-β”-alumina polycrystal as solid electolyte in Na/S and Na/NiCl2 batteries. The K-β”-alumina compound is a suitable precursor material to establish proton conducting materials by ion exchange. Tests with single crystal and polycrystalline samples showed the possible application in fuel cells operating between 150 - 250 °C.

One of the main problems to be solved is the correlation between composition and phase evolution of either β- or β”-phase, another problem occuring during sintering is the high vapor pressure of the alkaline oxide. This leads to the decomposition of the highly conductive β”-alumina phase into β-alumina or corundum phases and lowers significantly the ionic conductivity.

We investigated the beta alumina phase evolution using alumina raw materials with different crystallographic structure and grain size. The influence of initial alkaline content and dopant concentration on phase formation and phase stability under sintering conditions has been investigated. A refined phase diagram for Na- and K-beta aluminas will be presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 393: Symposium W – Materials for Electrochemical Energy Storage and Conversion , 1995 , 61
Copyright
Copyright © Materials Research Society 1995

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References

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