الملخص

In order to study the practicability delimitating the optimal electrical properties have been studied for soft ferrite system Mn|.xZnxFe204, which prepared by solid state method in the temperature range 300 to 550 K by substituting Mn2+ ions instead of Zr,2+ ions. The resulting of this study shows that the electrical conductivity for these systems were optimal value (10"6 £T! cm. The calculation of activation energy gave of 0.25 eV and 0.33 eV, The positive sign of thermoelectric power (seeback coefficient) for these systems means that the majority carriers were holes, Also the optimal magnetic susceptibility properties resulted in values -132xlO"5 , -662x1 0'5. From the electrical properties (electrical conductivity and thermoelectric power ) and magnetic susceptibility, the optimal results when concentration ions for these systems is Fe2O4 , which means equaled 0.4 to Zn2+ ions and 0.6 الخلاصة