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In order to verify an effectiveness of a dielectric relaxation in the investigation of oxygen ionic conduction mechanism, dielectric and DC, AC measurements have been carried out for single crystalline 8 mol% YSZ. Total activation energies in the dielectric relaxation and the electrical conduction was almost same below Tc. Activation energies change at Tc. Disagreement of both energies above Tc have been improved by the modification of the dielectric relaxation analysis.