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Polycrystalline Li 0⋅ ⋅5-x/2 Cd x Fe 2⋅ ⋅5-x/2 O 4 ferrites where x = 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 to x = 0⋅ ⋅3 and then it decreases for higher values of x. A similar trend is observed in the variation of Ms with Cd 2+ content. The initial permeability (µ µ i) is however found to increase continuously with x. The increase in µ µ i is attributed to decrease of anisotropy constant K 1 and higher grain size of the samples.

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