Influence of nickel-zinc ratio on microstructure, magnetic and dielectric properties of Ni_((1-x))Zn_xFe2O4 ferrites

摘要

Ni_((1-x))Zn_xFe2O4 (x = 0 -1.0) ceramics were synthesized by a conventional solid-state reaction method. The samples have been investigated for their structures, microstructures, dielectric and magnetic properties in detail. A pure spinel crystal structure was obtained in the sintering temperature range of 1150-1250 °C. The dielectric properties of part samples present a Debye relaxation phenomenon. The Curie temperature reduces linearly with the zinc concentrations. The magnetic permeability and saturation magnetization increase firstly to high values and then reduce with the zinc concentration. But the coercivity shows a different behavior. It increases at first and then decreases for the samples sintered at 1200 °C while it descends monotonically with the zinc concentration for the samples sintered at 1250 °C.