Abstract
Nuclear spin-lattice relaxation measurements are reported for 27Al in Na-, K-, and Na 0.5K 0.5 β-alumina in the temperature range 5–670K. A shallow T 1-minimum is observed at ∼35K in the mixed cation compound and is attributed to a substantially altered population of two-level system (TLS) tunneling modes. The high temperature T 1-minimum in the alloy crystal occurs at a significantly higher temperature than in either the Na- or K β-alumina. Both phenomena are discussed in terms of mixed ion pair distributions and are consistent with other manifestations of the mixed alkali effect in β-alumina reported in the literature.
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