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Low-Lying Excitations and Local Motions in Na β-Alumina

Published online by Cambridge University Press:  15 February 2011

Marco Villa  and
John L. Bjorxstam
Marco Villa
Affiliation:
Istituto di Fisica “A. Volta” e Gruppo Nazionale di Struttura della Materia delC.N.R., 27100 Pavia, Italy
John L. Bjorxstam
Affiliation:
Department of Electrical Engineering, University of Washington, Seattle, WA 98195
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Abstract

We present an NMR study of sodium motion and distribution in Na β-alumina below 160K. The 23Na lineshape shows that a rearrangement of sodiums occurs near 100K. Below this “transition”, a fraction of the sodium ions undergo a local motion that is an efficient mechanism for 23Na spin-lattice relaxation in the interval 50÷80K. This motion does not have a major influence upon the 27A1 relaxation. Below 50K the low-lying excitations typical of glasses control the spin-lattice relaxation processes of 27AI and, to a certain extent, 23Na.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 3: Symposium – Nuclear and Electron Resonance Spectroscopies Applied to Materials Science , 1980 , 289
Copyright
Copyright © Materials Research Society 1981

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References

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