NMR-STUDY OF ONE-DIMENSIONAL IONIC CONDUCTOR WITH HOLLANDITE-TYPE STRUCTURE .2. FREQUENCY-DEPENDENCE OF SPIN-LATTICE RELAXATION-TIME OF AL-27

Frequency dependence of spin-lattice relaxation time T//1 of **2**7Al in one-dimensional K** plus ion conductor, K-Al-priderite, was measured at 45 K in the frequency range from 10. 1 MHz to 55 MHz. It is found that T//1 agrees well with the continuum diffusion model. The intrinsic activation energy is determined to be 0. 058 ev. It was concluded that the introduction of the two barrier model which assumes the existance of two different barriers, the intrinsic barrier and the impurity barrier, is necessary to explain the temperature dependence of T//1.