Nickel-Magnesium-Copper ferrites with the general chemical formula Ni0.5 Mgx Cu0.5-x Fe2O4 with x=0.1, 0.2, 0.3, 0.4, and 0.5, were synthesized by sucrose precursor technique. Resistivity, as a function of composition, was measured from room temperature to 700oC by two probe method. These ferrites show higher resistivity than those prepared by conventional ceramic method. This is attributed to the control over composition and microstructure by sucrose method. On account of high resistivity and low eddy current losses, these ferrites find wide applications over a wide range of high frequency devices. Conduction in ferrites obeys Verway de Boer mechanism.