Dispersion of temperature dependencies of direct electrical conductivity values of samples prepared from ultrafine powders of zirconia ceramics (ZrO2 : 11 mol.% CaO) was found as a function of powders time storage. The significance of the powders homogeneity reached by the additional grinding before the samples preparation for obtaining of reproducible values of direct electrical conductivity is presented. There is shown that temperature dependencies of absolute values of direct electrical conductivity are depended on the phase composition of the ceramic sample. There was found on the base of measurements the heating temperature 1400_C as a sufficient for searched powders.
