Precursors with NiCO3·2Ni(OH)2·2H2O-and Fe2O3·nH2O-coated alumina,graphite and cenosphere were synthesized by precipitation using ferrous sulfate,nickel sulfate,ammonium bicarbonate,alumina,graphite and cenosphere as the main starting materials.Magnetic γ-FeNi-coated alumina,graphite and cenosphere core-shell structural microspheres were subsequently prepared by thermal reduction of the as-prepared precursors at 600℃ for 2h.Precipitation parameters,e.g.concentration of ceramic micropowders(10g/L),sulfate solution(0.2mol/L),rate of adding reactants(3mL/min)and pH value were optimized by a trial-and-error method.Powders of the precursors and the resulting coating of γ-FeNi with grain size below 40nm on alumina,graphite and cenosphere microspheres were characterized by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The magnetic properties of the nanosize γ-FeNi-coated alumina,graphite and cenosphere microspheres were measured by vibrating sample magnetometer(VSM).The results show that the core-shell structuralγ-FeNi-coated ceramic microspheres exhibited higher coercivity than pure γ-FeNi powders,indicating that these materials can be used for high-performance functional materials and devices.