Abstract
Conduction properties of Rb + ion in Rb-Al-priderite, Rb 1.49Al 1.65Ti 6.35O 15.92, and K + ion and Rb + ion in (K,Rb)-Al-priderite, K 0.83Rb 0.68Al 1.73Ti 6.23O 15.89, were investigated by NMR using 27Al in the framework as a probe. Size effect was observed remarkably in the activation energies. Frequency dependence of T 1 in Rb-Al-priderite at a low temperature is T 1 ∞ ω 1.53±0.09, indicating that the relaxation behavior of 27Al in Rb-Al-priderite is also described by the continuum model. Barrier height distributions and “attempt frequencies” in both samples obtained by a curve-fitting method are discussed in comparison with those of K-Al-priderite.
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