Abstract
An analysis of electrical conductivity relaxation and nuclear magnetic resonance spin-lattice relaxation has been conducted to study the dynamics of the ionic diffusion process in the crystalline ionic conductor Li 0.5La 0.5TiO 3. Dc conductivity shows a non-Arrhenius temperature dependence, similar to the one recently reported for some ionic conducting glasses. Taking into account this non-Arrhenius dependence for the relaxation times, spin-lattice and conductivity relaxations are compared in the same frequency and temperature ranges. A single “stretched exponential” relaxation function of the form f( t)=exp(−( t/ τ) β ), with β=0.4, can be used to describe both relaxation processes in which correlation times differ in the preexponential factor.
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