NMR study of low-energy excitations in Naβ-alumina

1 November 1982

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 26 (9), 5226-5229
https://doi.org/10.1103/physrevb.26.5226

Abstract

Al27 and Na23 NMR relaxation measurements are reported for Na β-alumina in the temperature range ∼4-120 K. Below ∼55 K, T1 exhibits a power-law dependence on temperature similar to that observed in a wide variety of disordered solids and attributed to the presence of energetically low-lying excitations. The T1 behavior in the temperature region ∼55-120 K can be described by a thermally activated motional process with EA≈0.05 eV. The Na23 spin-spin relaxation time T2 decreases monotonically with increasing temperature, suggesting that nuclear spin dephasing by ion diffusion in static electric-field-gradient inhomogeneities is appreciable.

Keywords

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