Cadmium substituted high permeability lithium ferrite

Polycrystalline Li0.5-x/2CdxFe2.5-x/22O4 ferrites wherex = 0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 were prepared by a double sintering ceramic technique and characterized by X-ray diffraction and scanning electron microscopy (SEM). The lattice parameter is found to increase monotonically with the cadmium content. It is explained in terms of the sizes of component ions. The grain size of the samples increases up tox = 0.3 and then it decreases for higher values ofx. A similar trend is observed in the variation of Ms with Cd2+ content. The initial permeability (μi) is however found to increase continuously withx. The increase in μi is attributed to decrease of anisotropy constant K1 and higher grain size of the samples.