Effect Of Mixed Addition On Magnetic Properties Of Mn-Zn Ferrites With High Permeability

MnZn ferrite is the key materials of modern electronic industry and information industry. With the rapid development of telecommunication and computer technology. For high permeability ferrite, high initial permeability with better stability is needed. For this reason, this dissertation presents a deeply study on the preparation technology and mechanism of high properties MnZn ferrite.The magnetie origin of MnZn ferrite can be interpreted by the crystal structure and chief performance parameter of MnZn ferrite. Magnetocrystalline anisotropy and magnetostriction can be investigated. The mechanism of MnZn ferrite initial permeability is discussed from the concept of magnetic domain. The influencing factor of high initial permeability MnZn ferrite is summarized.The preparation technology of MnZn ferrite is discussed. The formation mechanism of MnZn ferrite is studied. The preparation method and Fe₂O₃, Mn₃O₄ ZnO match of MnZn ferrite are explained. The effect of sintering parameters suah as sintering temperature, atmosphere, on the MnZn ferrite magnetic properties is also discussed.The key technology for preparation high initial permeability MnZn ferrite is chosen proper component, added in proper content dopants and sintered under optimal sintering condition. The permeability and density of MnZn ferrite is increased with containing proper content dopants in high permeability MnZn ferrite, for these dopants can promote grain growth. The results showed with 0.1 mass fraction Nb₂O₅-P₂O₅ addition (w (Nb₂O₅): w(P₂O₅)=2:8), initial permeability of 11690 and density of 5.17 g/cm³ are obtained. With 0.08 mass fraction Nb₂O₅-P₂O₅ addition (w(Bi₂O₃): w (MoO₃)=4:6), initial permeability of 12039 and density of 5.19 g/cm³ are obtained. The conclusion conforms with micrograph analysis.