Influence of V₂O₅ Addition on the Magnetic and Electrical Properties of Iron-Deficient Ni-Zn Ferrite

Abstract

The influence of V₂O₅ addition on the magnetic and electrical properties of iron deficient ferrites with composition: Ni_0.65Zn_0.35Fe_1.96O₄+xV₂O₅ have been investigated, where values of x (in mol unit) are 0, 0.002, 0.004, 0.006, 0.008 and 0.01. The sintered density, saturation magnetization, Curie temperature of the samples increase up to V₂O₅ (x=0.004) and then decrease. The addition of V₂O₅ to the composition of ferrite increases the anion vacancy concentration, prohibit the discontinuous grain growth, which in turn enhances the density. The increment of saturation magnetization is due to the enhancement of resultant sublattice magnetic moment and density. Upto V₂O₅ (x=0.004), V₂O₅ goes into solid solution with the ferrite matrix and increases the Curie temperature. This is probably due to ions occupy some octahedral sites (B-sites) of the ferrite lattice by V⁵⁺ , as a result some Fe³⁺ ions may come out from octahedral to tetrahedral sites (A-sites) thereby increasing A-B interaction and hence the Curie temperature. The dc resistivity of all the samples increases with the increment of V₂O₅ in the compound.

DOI: 10.3329/jbas.v33i2.4097

Journal of Bangladesh Academy of Sciences, Vol. 33, No. 2, 145-149, 2009