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Exafs Studies of Defects in β-Alumina Superionic Conductors1

Published online by Cambridge University Press:  25 February 2011

W. L. Roth  and
R. Wong
W. L. Roth
Affiliation:
Department of Physics, State University of New York, 1400 Washington Avenue, Albany, N. Y. 12222
R. Wong
Affiliation:
Department of Physics, State University of New York, 1400 Washington Avenue, Albany, N. Y. 12222
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Abstract

The local structures of Zn and Co in solid solution in Na βN–alumina have been investigated using EXAFS spectroscopy. These additives are members of a group that must be incorporated in βN–alumina to stabilize the rhombohedral structure. It is found that they are tetrahedrally coordinated to four oxygen atoms. The N–O bond distances are larger than the Al–O distance in β–alumina and larger than the Al(2)–O distances in disordered crystals determined by x-ray and neutron diffraction. The bonds about individual ions and mixtures of ions are consistent with predictions from bond-strength-bonddistance theory. A preliminary study of Na β–alumina that has been implanted with in and annealed indicates that a substantial fraction of the Mn is tetrahedrally coordinated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 41: Symposium K – Advanced Photon and Particle Techniques for the Characterization of Defects in Solids , 1984 , 301
Copyright
Copyright © Materials Research Society 1985

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Footnotes

1

This work was supported in part by the Office of Naval Research.

References

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