MICROSTRUCTURE STUDIES ON TI4-SUBSTITUTED AND ZR4+-SUBSTITUTED LI-ZN FERRITES()

XRD and microstructure studies were carried out on Ti4+ and ZT2+-subst ituted Li-Zn ferrites prepared by standard ceramic technique. All the ferrite compositions exhibit single phase formation. The lattice param eter a increases linearly with the content of Zn2+ Zr4+ and Zn2+ Ti4+, which is attributed to the ionic volumes of the cations involved. Wit h substitution by Zr4+ the average size decreases, while with substitu tion by Ti4+ the grain size increases. In both the series grain size v aries with the composition. Excess substitution of Zr4+ (x > 0.4) lead s to the formation of secondary images and discontinuous grain growth. Both Zr4+ and Ti4+ compositions obey Kurtz theory.