Effect of substitutions of In3+ions on the electromagnetic properties of NiZn microwave polycrystalline ferrite materials
Microwave polycrystalline spinel NiZn ferrite materials were prepared by common ceramic process.The effects of substitutions of In3+ions on the microstructure and electromagnetic properties of NiZn ferrite materials were studied.The results show that when the substitution amount x of In3+ion is in the range of 0-0.2,the saturation magnetization of the material changes very little at 4πMs,the porosity p slightly decreases,and the ferromagnetic resonance linewidth of the material ΔH-broadening with anisotropy ΔHa is the main factor;When x>0.2,the saturation magnetization of the material decreases significantly by 4πMs,the porosity p increases,and the ferromagnetic resonance linewidth of the material increases ΔH widens with pores ΔHp is the main focus.Replacing NiZn ferrite with In3+enhances the ferromagnetic resonance linewidth of the material ΔH significantly decreases,and the dielectric loss angle tangent tanδε reduce to 0.5×10-4,the Curie temperature approximately decreases linearly.The sintering temperature range of In3+substituted NiZn ferrite is wide,and sintering at temperatures ranging from 1200 to 1240℃,results in 4πMs,ΔH and tanδε changes are relatively small,and the process implementation is easy.
microwave polycrystalline spinel ferrite materialsubstitutions of In3+ionssaturation magnetizationferromagnetic resonance linewidthdielectric lossCurie temperature
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