Abstract
Results of ac conductivity and 7Li NMR measurements are reported for Li-doped priderites with the hollandite-type structure.ac conductivities are well explained by the transport theory in the disordered one-dimensional (1D) systems. The spin-spin relaxation shows a decay of the form exp(- t 3 2 ) characteristic of 1D diffusional motion. The temperature dependence of the spin-lattice relaxation time T 1 gives a very low activation energy due to the diffusional motion of Li + ions. If an enhancement factor of 3 in assumed in the 1D system, an activation energy of ≈0.06eV is obtained for the diffusional motion.
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