Study On Preparation And Properties Of Ni-Zn Ferrite With High Performance

With the development of information technical and digitalization of electronic products,the development of devices put forward to miniaturization,wide band,high performance and low-loss.This put formard to high standmard to soft magnetic ferrite materials.In this paper Ni-Zn ferrite were prepared by the conventional ceramic method, and the influence of the properties of Ni-Zn ferrite using by different presingter temperature, different sintering temperature, different contant of Ni2+ and different additives as La3+,Nd3+,Cu2+ were studied.(1) The structure and properties of Ni0.5Zn0.5Fe2O4 ferrite were investigated. The result show that the second phase Fe2O3 appear as presintered at 950℃and 1000℃. The lattice constant decrease and the grain size increase gradually with the increasing of the presintering temperaturer. The lattice constant of the samples increase at first, and then decrease, while the grain size and the density increase with the increasing sintered temperature. The dielectric constant decreases at first and it reaches the min. as sintered at 1200℃,and then increase. The resistivity increase at first, and then decrease. The dielectric constant of the sample as sintered at 1300℃has a peak, it is appeared an abnormal phenomenon.(2) The structure and properties of NixZn1-xFe2O4 (x=0.3-0.7) ferrite were investigated. The result show that the lattice constant, the density and the dielectric constant decrease with the increasing Ni2+ content, but the grain size increase. The saturation magnetization increase at first, and then decrease with the increasing of Ni2+ constant, it has peak of 80.23emu/g when x=0.5. The dielectric loss (tanδ) of all the samples have peaks, and appear an abnormal phenomenon except Ni0.3Zn0.7Fe2O4.(3) The structure and properties of Ni0.5Zn0.5LaxFe2-xO4(x=0.002-0.010) ferrite doped La3+were investigated. The result show that the second phase LaFeO3 appear for Ni0.5Zn0.5La0.008Fe1.992O4 and Ni0.5Zn0.5La0.01Fe1.99O4. The lattice constant, grain size and the dielectric constant increase at first, and then decrease with the increasing of La3+ constant, each of them has a peak when x=0.006, but the density increase. The resistivity and the saturation magnetization decrease at first, and then increase with the increasing of the La3+ constant, and they all have the min. when x=0.006. The dielectric loss (tanδ) of all the samples have peaks, appear an abnormal phenomenon except Ni0.5Zn0.5La0.002Fei1.998O4.(4) The structure and properties of Ni0.5Zn0.5NdxFe2-xO4(x=0.002-0.010) ferrite doped Nd3+were investigated. The result show that the second phase NdFeO3 appears for Ni0.5Zn0.5Nd0.01Fe1.99O4 ferrite. The lattice constant increase, but the density,dielectric constant and dielectric loss (tanδ) increase at first,and then decrease with the increasing of Nd3+ constant, they all have the max. when x=0.008. The saturation magnetization decrease with the increasing of La3+ constant, it reaches the peak of 71.22emu/g. The dielectric loss (tanδ) of all the samples have peaks, appear an abnormal phenomenon.(5) The structure and properties of Ni0.5-xCux Zn0.5Fe2O4(x=0.12-0.28) ferrite doped Cu2+ were investigated. The result show that the second phase CuO and CuFe2O4 appear as x=0.24,0.28. The lattice constant decrease, but the grain size increase and the density increase at first, and then decrease with the increasing of Cu2+ doped constant, and the density has the max. of 5.30g/cm3 when x=0.020; The resistivity and saturation magnetization increase at first,and then decrease, they all reach the max. when x=0.20, but when x>0.24, the saturation magnetization increase again.