DC ELECTRICAL-PROPERTIES OF ZN-NI FERRITES

DC electrical resistivity was studied for ZnxNi1-xFe2O4 samples (with x = 0, 0.2, 0.4, 0.6, 0.8 and 1) prepared using the usual ceramic tech nique as function of temperature T and composition x. The DC electrica l resistivity p, Curie temperature T-c and activation energies for ele ctric conduction in ferrimagnetic (E-f) and in paramagnetic (F-p) regi on decrease as zinc ion substitution increases. The ferrite samples st udied have a semiconductor behavior where electrical resistivity p dec reases on increasing the temperature. The activation energy for the el ectric conduction in the paramagnetic region was found to be higher th an that in the ferrimagnetic region. The resistivity p increases as po rosity increases. A new empirical formula was suggested for compositio n dependence of electrical resistivity.