Influence of two-step sintering on power loss and permeability dispersion of MnZnNi ferrite

Manganese-zinc-nickel (MnZnNi) ferrite nanoparticles with the chemical composition Mn0.2Zn0.5Ni0.3Fe2O4 were prepared via co-precipitation method. Using the prepared nanoparticles, ring-shaped cores were formed and subjected to two-step sintering. Then, magnetic permeability, magnetic losses, density and microstructure of the samples were examined and compared with those of ferrites produced by the single-step sintering process. It was found that upon reducing the isothermal temperature from 1350 degrees C to 1250 degrees C, the density of the samples increased from 4.39 to 4.71 gr/cm(3) and the average grain size diminished from 10.1 to 2.2 mu m. The samples prepared through the two-step sintering method with a high temperature of 1350 degrees C and a lower temperature of 1250 degrees C exhibited a good performance in terms of loss and permeability. The two-step sintering process is an efficient method to produce high density and permeability plus low-loss ferrites.

Automated summary

MnZnNi ferrite nanoparticles were synthesized using co-precipitation method and then used to form ring-shaped cores through two-step sintering. Reducing the sintering temperature resulted in increased sample density and decreased grain size. The two-step sintering process proved to be an effective method for producing ferrites with high density, permeability, and low losses.