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Ferrite compositions of Ni 0.65 Zn 0.35 Cu x Fe 2-x O 4 (0=<x<1) were examined using X-ray analysis. The effect of the linear distance of vacancy jumping on the lattice parameter was studied. The jump rate of vacancy increased with increasing Cu concentration. The increase of jump rate of vacancy enhanced the linear distance which increased the conductivity and mobility of the charge carriers. The majority of charge carriers of our systems are holes. The estimated linear distance of each jump was 2.86x10 -7 m. The decrease of thermal conductivity was attributed to the increase of the jump rate and also the linear distance. The formation of oxygen vacancies during the substitution of Cu 2+ ions for Fe 3+ ions helped the internal stress to decrease the lattice parameter. Because the ionic radius of O 2- (0.136nm) is larger than that of Fe 3+ (0.067nm) ion.