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Iron nitride-material of magnetic liquid

Nano-magnetic materials are one of the research hotspots in the field of materials in the world. At present, there are many types of nano-magnetic particles that can be prepared, such as ferrite, γ-Fe2O3, Fe3 O4, BaFe12 O19, metal magnetic powder, rare earth alloy and iron nitride. Etc. Among them, ferromagnetic powder is a new type of magnetic material developed in recent years. It is not only excellent in magnetic properties, but also has strong anti-oxidation and wear resistance. It is an ideal new-generation magnetic material. The preparation and application development research has been widely recognized by countries all over the world. It is expected that ferromagnetic magnetic materials will be widely used in high-density magnetic recording, magnetic fluid, magnetic sensor and microwave materials, as well as catalysis and environmental management.
The iron nitrides are mainly ε-Fe3N, γ-Fe4N and Fe16 N2, which were first discovered in the hardened layer of nitriding treatment of steel. According to domestic and foreign literatures, the magnetic properties of Fe16N2 are the most in iron-nitrogen compounds. Well, its specific saturation magnetization reaches 230.8 emu/g, which is higher than pure α-Fe (219 emu g). It is the highest saturation magnetization found, but it is metastable. Magnetic powder preparation is very difficult. At present, the magnetic film is mainly prepared. γ-Fe4 N has a perovskite structure and can be considered as the body center position of N atoms occupying the face-centered cubic γ-Fe, which is close to the saturation magnetization and α-Fe. , reaching 193 emu/g , but its oxidation resistance and wear resistance are the best, it is an ideal high-density recording material; ε-Fe3N magnetic properties are relatively poor, but still much higher than the currently widely used γ-Fe2 O3, Fe3O4 And magnetic materials such as BaFe12 O19 are materials for preparing a new generation of magnetic liquids.