Cation distribution of Li-Ti mixed ferrites (abstract)

Abstract

Lithium-titanium mixed ferrites of different compositions have been prepared by the well known ceramic technique. Thermo power studies of these samples, after usual characterization by x-ray diffraction (XRD), bulk density, porosity, etc. have been measured by the differential method. Room temperature values of the Seebeck coefficient are found to vary from 2.3 to 114 μV/K. It is an established fact that the thermo power measurement would also be used to study the cation distributions on octahedral and tetrahedral sublattices of ferro spinel. This technique was successfully used in the study of cation distribution of Fe3O4, Fe3O4-TiFe2O4, etc. As such the cation distribution of Li-Ti mixed ferrites of P.I. has been arrived at using thermo-power data by assuming that small polorans rather than electrons/holes are responsible for the process of conduction. A knowledge of cation distribution among octahedral sites of a spinel ferrite is essential to understand the mechanism responsible for electrical properties like electrical conductivity, thermo power, dielectric properties, etc. Saturation magnetization of all the samples has also been obtained by the well known oscillation method. From the cation distribution it has been observed that the concentration of Ti4+ on octahedral sites is found to increase while those of Fe3+ and Fe2+ are found to decrease rapidly.