Abstract :
Polycrystalline samples of Co1–xZnxFe2O4 with
stoichiometric proportion (x) varying from 0.0 to 1.0 were
prepared through the thermal decomposition of their
respective oxalates. The samples were calcined at 1000 C
for 3 h and characterized using X-ray diffraction (XRD)
and Mo¨ssbauer spectroscopy techniques. The study of the
cation distribution using Mo¨ssbauer spectroscopy showed
that the ions at the tetrahedral site moved to the octahedral
site by the addition of zinc and that the system varied from
an inverse to a normal spinel structure. The values of the
lattice parameter, X-ray density, oxygen parameter, inversion
factor and radii of tetrahedral and octahedral sites
were calculated using X-ray diffraction data. The temperature
dependence of the conductivity showed a definite
kink, except for the ZnFe2O4 sample, which can be
attributed to the ferromagnetic–paramagnetic transitions.
The calculated activation energy in the paramagnetic
region was found to be smaller than that in the ferromagnetic
region
