The influence of La-substituted Cu_(0.5)Co_(0.5)Fe_2O_4 nanoparticles on its structural and magnetic properties

摘要

Lanthanum substituted cobalt ferrite Cu_(0.5)Co_(0.5)Fe_(2-x)La_xO_4 (x = 0,0.01,0.03,0.05) powders have been prepared by a sol-gel method. X-ray diffraction (XRD) results indicate the production of a single phase cubic-spinel structure. Both the lattice parameter and grain size decrease with the substitution of La~(3+) ions. Scanning electron microscope (SEM) shows that the ferrite powers are nanoparticles. Room temperature Moessbauer spectra of Cu_(0.5)Co_(0.5)Fe_(2-x)La_xO_4 are two normal Zeeman-split sextets, which display ferrimagnetic behavior. The saturation magnetization, coercivity and residual magnetization increase at first and then decrease with the incorporation of La~(3+).