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Ferrite is an important class of functional materials , widely used in the field of microwave , electrical equipment , etc. , at the same time has a good prospect in the catalyst , environmental protection and other fields . In this paper, sol - gel preparation of different types of ferrite nanocrystals , including NiFe 2 O 4 , MgFe 2 O 4 the ZnFe 2 O 4 , of CoFe the 2 O 4 Ni -Mg Co. -Zn, Ni-Zn ferrite. By thermal gravimetric analysis , the modern analytical means of infrared spectroscopy, X -ray diffraction , scanning and transmission electron microscopy to characterize the structure and performance of the product , to discuss the preparation conditions on the performance of the product , to optimize the preparation process . The sol - Gel Preparation of NiFe 2 O 4 the MgFe 2 O 4 ZnFe 2 < / sub> O 4 , CoFe 2 O 4 nanocrystals process influenced by many factors : organic acids choice , gelling agent and the ratio of the amount of the metallic species , pH, and the calcination temperature . NiFe the ferrite . 2 O 4 the doped Mg 2 and Zn 2 made Ni1 - XMgXFe < sub > 2 O 4 and Ni1-XZnXFe 2 O 4 series ferrite nanocrystals ; CoFe 2 < / sub > O 4 ferrite doped Zn2 made the Co1 - XZnXFe 2 O 4 series ferrite nanocrystals . Using XRD test studied by means of doping ions on the particle size and lattice constant . To use powder sample magnetometer determination NiFe 2 O 4 , MgFe 2 O 4 , ZnFe 2 O 4 , CoFe 2 O 4 nanocrystalline magnetic properties . Compared to bulk materials , ferrite nanocrystals with unique magnetic properties , the article discusses the preparation conditions on the magnetic properties . Also discussed doping ions on the magnetic properties of the composite ferrite .
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