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A series of La substituted MgCuZn ferrite powders(Mg0.35Cu0.05Zn0.60LaxFe2-xO4 with,x = 0.00,0.01,0.03 and 0.05)were synthesized by a novel microwave sintering method.The effect of La-substitution on the structural,physical and magnetic properties has been studied.X-ray diffraction confirmed the formation of single phase cubic spinel lattice for all the compositions studied.The lattice constant increased with increasing La content,might be attributed to the larger ionic radius of La3+ than the Fe3+.X-ray density of each sample is higher than the corresponding bulk density of sintered sample.