Structural Analysis and Normalised Susceptibility Study of Zn Substituted Li-Cu Ferrite

Abstract

Lithium ferrites have attracted considerable attention because they have been used as replacements for garnets due to their low cost. A series of polycrystalline ferrite samples with the composition of Li x Zn 0.6−2x Cu 0.4 Fe 2 O 4 (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3) at different chemical reaction temperature (100˚C, 125˚C and 150˚C) were prepared using non-conventional microwave sintering method. The characterization was carried out using X-rays technique. The X-ray analysis confirms the formation of single phase cubic structure. The lattice parameter ranges from 8.3690 Å to 8.4653 Å. The X-ray density shows the variation as a function of temperature of synthesis. The variation of AC susceptibility with temperature shows the existence of single domain structure for x ≥ 0.2 when the chemical reaction carried at 125˚C and 150˚C and exhibits super paramagnetic structure for all the composition prepared at 100˚C. The samples x ≤ 0.2 shows multidomain structure for all the samples prepared at 125˚C and 150˚C. The Curie temperature obtained using the susceptibility data are found to be in the range 350˚C to 700˚C. An attempt has been made to synthesis the nanoparticles at lower reaction temperature by using non-conventional microwave sintering method.