采用不同溶剂制备NFO粉体及性能研究

he NFO powders were prepared by Sol-Gel method using ethylene glycol monomethyl ether and citric acid as solvents, respectively. The exothermic and endothermic effects of the powders were obtained by DSC. The phase structures of calcined powder were investigated by XRD. The results show, that the main phases exist in the NFO powders calcined at 600℃, but there were still secondary phases (Fe2O3). With the increase of calcination temperature, the amounts of secondary phases decrease gradually. There were no secondary phases in the powders calcined at 800℃ using ethylene glycol monomethyl ether as solvent. This indicates that NFO powders with higher purity can be obtained by using ethylene glycol monomethyl ether as solvent. The average grain sizes and morphology of powders were analyzed by TEM. Results show that the grain sizes of powders calcined at 800℃ using ethylene glycol monomethyl ether as solvent are homogeneous and the average grain size is about 80nm.