Microstructure studies on Ti4+- and Zr4+-substituted Li-Zn ferrites

XRD and microstructure studies were carried out on Ti⁴⁺ and Zr⁴⁺-substituted Li-Zn ferrites prepared by standard ceramic technique. All the ferrite compositions exhibit single phase formation. The lattice parametera increases linearly with the content of Zn²⁺Zr⁴⁺ and Zn²⁺Ti⁴⁺, which is attributed to the ionic volumes of the cations involved. With substitution by Zr⁴⁺ the average size decreases, while with substitution by Ti⁴⁺ the grain size increases. In both the series grain size varies with the composition. Excess substitution of Zr⁴⁺ (x>0·4) leads to the formation of secondary images and discontinuous grain growth. Both Zr⁴⁺ and Ti⁴⁺ compositions obey Kurtz theory.