The precursors of composite oxides were synthesized by microwave radiation and far infrared radiation heating, in which Co(NO_3)_2·6H_2O and Nd(NO_3)_3·nH_2O were used as starting material, citric acid as complexing agent and NH_3·H_2O as medium. The microwave radioactive heating can accelerate the formation of sol. The precursors were analyzed by TGA-DTA. Black powders were successfully prepared by heating at different temperature in muffle furnace. The structure and crystal size of the powders were charac...
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