Abstract
27A l NMR T 1 measurements for Na-, K-, and Na 0.5K 0.5β-alumina in the temperature range ∼5–180K are reported. Both Na- and Kβ-alumina exhibit a nearly linear temperature dependence of the spin-lattice relaxation rate T −1 1 up to ∼55K which is attributed to the presence of two-level system (TLS) tunneling modes. A shallow T 1 minimum at ∼30K is observed in Na 0.5K 0.5β-alumina. It is suggested that the origin of this minimum is associated with the distribution of TLS parameters, and may be a low-temperature manifestation of the mixed-alkali effect commonly observed in glasses in the higher temperature ionic hopping regime.
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