Influence of yttrium ions on the magnetic properties of Ni-Zn ferrites

The ferrites having the general formula Ni1-xZnxFe2O4 with 0≤x≤0.5 and Ni0.5Zn0.5YyFe2-yO4 with 0.02≤x≤0.10 were synthesized under atmospheric pressure, and showed single spinel phase in X-ray diffractogram patterns. The structural properties and the magnetic behavior at different magnetic fields and concentration of the substituted nonmagnetic (Zn2+) and yttrium (Y3+) ions were studied. The magnetic constants have been calculated from DC magnetic susceptibility measurements. The transition from ferrimagnetic to the paramagnetic state is accompanied by an increase in the thermo-emf. It was observed that the magnetic moment of the system and the Curie temperature decreased by substitution of Zn. This means that some cations on the B site migrate to the A site which control the physical properties of the system