Structural and magnetic studies of the Co1+xTixFe2(1−x)O4 ferrites

Abstract

The cubic spinel Co1+xTixFe2(1−x)O4 ferrites, 0.0≤x≤0.5, were prepared by the standard ceramic technique. The samples were examined using the techniques; XRD, FT-IR, SEM and VSM. The average lattice parameter showed dependence on x, whereas the crystallite and grain size and strain did not. The infrared spectra showed six absorption bands in the range of 200–1000cm−1. They were assigned to the corresponding metallic ion–oxygen bonds among the A- and B-sites. The absorption bands ν1 and ν2 and their intensities and force constants F1 and F2 were increased against x. Using the transmitted and absorbed energy, the IR velocity and refractive index and jump rate of vacancies were determined and discussed as functions of x. The trend of sauration magnetization Ms was decreased with x, whereas that of coercivity and anisotropy constant was increased. The determined Debye temperature and stiffness constant of the samples were discussed as functions of x. The absorption bands ν1 and ν2 proved dependence on the distance between magnetic ions (hopping length) LA-A and LB-B at the A- and B-sites, respectively, whereas F1 and F2 proved dependence on Ms.