Research On Fe-O Compound And Fe-N Compound Doped With Ⅲ-group Ions

Fe-N compound is a kind of typical magnetic materials. It has a broad application prospect in the magnetic electronics and other fields for its special properties. For Fe-N material, the microstructure and magnetic properties will be significantly affected by doping ions. We prepared the Fe-N compounds doped with Ⅲ-group ions by sol-gel method and high temperature nitridation. As the intermediate product in the process of preparation, Fe-O compound doped with Ⅲ-group ions has also been investigated. The main results are as follows:For Fe-O compound samples, Fe₂O₃ and Fe₃O₄ were observed when the oxidation temperature is below 300 oC. When the oxidation temperature is higher than 400 oC, we observe the Fe₂O₃. For Fe-O compound doped with Ga ion, Al ion or In ion sample, we observed the existence of Fe₂O₃ and Fe₃O₄ when the oxidation temperature is lower than a certain value, and the certain value varies according to the ion. When the oxidation temperature increased, we only observed the Fe₂O₃.For Fe-N compound doped with Ga ion or In ion sample, we observed the γ cubic and ε hexagonal phase under the condition of different nitriding temperature. For Fe-N compound doped with Ga ion, we observed both of the γ cubic and ε hexagonal phase when its preparation temperature is 950 oC and the concentration of Ga ion is 0.5%. When the concentration of Ga ion is 1% or 3.125%, only γ phase was observed. As the magnetism measurement show that, when the doping concentration of Ga is 0.5%, the Fe-N compound doped with Ga ionshow ferromagnetic and paramagnetic at the same time, and the ferromagnetic behavior is weaken when the Ga concentration increased.By investigating the properties of Fe-N compound doped with Ⅲ-group ions, we made clear of its basic structure and magnetic properties and provided the experimental basis for the application of the material in the field of magnetic electronics.