Effect of calcination temperature on electromagnetic property of Ni0.5Zn0.5Fe2O4 prepared by two-step method

The Ni0.5Zn0.5Fe2O4 nano absorbing materials were prepared by two-step method(coprecipitation method combined with sol-gel method), and the microwave absorption influence of the calcination temperature of the precursor in sol-gel method were explored. Moreover, the microstructure and electromagnetic properties of the as-prepared samples were characterized by the X-ray diffraction (XRD), atomic force microscope (AFM), vector network analysis (VNA). Consequently, XRD analysis indicates that the pure Ni0.5Zn0.5Fe2O4 nanoparticles can be obtained while the temperature is higher than 650 degrees C. The AFM results show that the microstructure size of the samples tends to be smaller and more uniform while the temperature is increased. Besides, the VNA results indicate the Ni0.5Zn0.5Fe2O4 exhibits best electromagnetic properties within 2 - 12. 4GHz at the calcination the temperature is 650 degrees C, and the as-prepared samples possess excellent microwave absorption performance. The qualified absorption bandwidth reaches 4.9GHz, and the maximum reflection loss reaches -24.94dB.