Effect of proportion of nickel and zinc in coprecipitation method on absorption property of Ni_0.5Zn_0.5Fe₂O₄ prepared by two steps

Abstract

Nano Ni0.5Zn0.5Fe2O4 powders were prepared by the coprecipitation method combined with sol-gel method. The microstructure and electromagnetic performance of the as-prepared four kinds of Ni0.5Zn0.5Fe2O4 samples with different addition proportion were characterized by X-ray diffraction, atomic force microscope (AFM), vector network analysis (VNA). The results show that the pure Ni0.5Zn0.5Fe2O4 is gained in each proportion under 650℃ calcination. The Ni0.5Zn0.5Fe2O4 particles are spherical, with the increase of adding proportion in coprecipitation process, particle size decreases first and then increases, the particles have the minimum size while the proportion is 60%, the average size is around 44nm. In the range of 2-12.4GHz, the greater the thickness of the material, the closer the effective absorption band of Ni0.5Zn0.5Fe2O4 is to the low frequency band, the maximum absorbing intensity of Ni0.5Zn0.5Fe2O4 can reach -24.94dB. While the proportion is 60%, the effective absorption band of Ni0.5Zn0.5Fe2O4 is 5.0-9.9GHz, the bandwith reaches maximum, and microwave absorption property is the best.

Keywords

• Ni_0.5Zn_0.5Fe₂O₄
• coprecipitation method
• sol-gel method
• microwave absorption property