Abstract
The motion of K+ ion in the one-dimensional ionic conductor, Al-priderite, with hollandite-type structure was investigated using 27Al in the framework as a probe. The temperature dependence of the spin-lattice relaxation time T1 showed that it is divided into two regions. In the low temperature region where the motion is dominated by the intrinsic barrier, the frequency dependence of T1 is proportional to ω1.5. The slope, δln(T1)/δ(1/T), in the low temperature side gives a small value of 29 meV. In the high temperature region, where T1 is influenced by the long range fluctuation of K+ ion over the impurity barriers, T1 becomes independent of the frequency, and this behavior may be due to the existence of reflecting walls introduced by impurities with high barrier height which K+ ion can not pass over.
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