Dielectric and dc measurements have been carried out on La0.8Sr0.2GaO3−δ, which has a high potential for the electrolyte material in a solid oxide fuel cell, so as to elucidate the correlation between O2− diffusion and electric conduction. A dielectric relaxation shows up in loss tangent. The relative relation of activation energies as to dielectric relaxation and dc conduction suggests the ionic conduction due to O2− diffusion assisted by free single oxygen vacancies taking place. The change of dc conductive behavior associated with attenuation of dielectric relaxation around 950 K indicates that another type of O2− diffusion dominates the ionic conduction at high temperature.
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