The variation of lattice parameter, saturation magnetization, and Curie temperature on the addition of Ti4+, Zr4+, and Sn4+ to some Ni‐Zn ferrite compositions are reported and the results are explained on the basis of the movement of the substituting ions first to the tetrahedral and finally to the octahedral sites of the spinel lattice.

Lattice parameter variation and magnetization studies on titanium‐, zirconium‐, and tin‐substituted nickel‐zinc ferrites

Ni0.5 Zn0.5 Fe2 O4 powder was prepared by standard ceramic methods at precalcination and ferritisation temperatures of 800° and 1250°C respectively. The ferrite was doped with oxides of titanium, zirconium and niobium in nominal weight percentages of 0.5, 1,2,5 and 10 of the respective oxides. Lattice parameter values and pycnometric densities of the doped samples were determined. The magnetic saturation moment σs (emu/gm) was determined at room temperature using a vibrating sample magnetometer at a maximum field of 6.5 koes. The base ferrite had a density of 5.258 gm/ml, a lattice parameter of 8.3974 A and a σs value of 71.44 emu/gm. Titanium doped ferrites showed a sharp fall in lattice parameter up to 0.0240 mole fraction followed by a monotonic rise at higher concentrations. The density value first increased and then decreased monotonically. Zirconium and niobium were slightly soluble up to 0.089 and 0.0012 mole fractions respectively as indicated by a constancy of the lattice parameters (at 8.399 A f...

A. R. Das

Papers

Effect of Titanium, Zirconium and Niobium on Lattice Parameter, Density and Magnetic Saturation Moment of Ni0.5 Zn0.5 Fe2 O4