Structure, morphology, and magnetic properties of high-performance NiCuZn ferrite

Abstract

High-performance submicron-scaled NiCuZn ferrites are prepared by the solid-state reaction method through using CuO as additive. In the synthesis process, a mixture of superfine powder is sintered at 900 • C for 3 h, and the obtained product is NiZn-ferrite with spinel structure. We observe that the particle size increases with raising the sintering temperature. The NiCuZn ferrite with relatively uniform size and granular shape has the best performance: its coercivity is 14 Oe (1 Oe = 79.5775 A•m −1 ) and saturation magnetization is 48 emu/g. We also study the effects of particle size, magnetocrystalline anisotropy, and microstructure on coercivity. The method presented here is convenient and economical for producing the high-permeability ferrite powders.

Effects of Mg substitution on the structural and magnetic properties of Co 0.5 Ni 0.5− x Mg x Fe 2 O 4 nanoparticle ferrites

“…The structural and magnetic properties of nanocrystalline ferrites are affected by a variety of factors including processing conditions, sintering temperature, precursor atmosphere, chemical composition, cation distribution in the tetrahedral (A) and octahedral [B] sites, grain size, voids, surface layers, and doping. [4][5][6][7] Spinel ferrites are made up of a regular combination of oxygen with the general formula of (A)[B] 2 O 4 . A crystal structure of spinel ferrite with the Fd-3m space group has 56 atoms.…”

High-frequency magnetic properties and core loss of carbonyl iron composites with easy plane-like structures*

“…At present, due to the advantages of high permeability, low core loss, and cheap price, soft ferrites, such as MnZn, NiZn, and NiZnCu ferrites, almost monopolize the SMMs in all power electronic devices. [8][9][10][11][12][13][14][15][16] However, these materials have an unsurmountable defect that their low saturation magnetization and operating frequency cannot meet the requirements of the next-generation power electronics. SMMs such as carbonyl iron, FeNi and FeSi have a natural resonance frequency up to GHz and can maintain a permeability that does not decrease with frequency.…”