Abstract

• Nickel-inc-Cobalt ferrites with the formula Ni0.97-xnx Co0.03 Fe2O4(where x = 0.25, 0.50 and 0.75) and pure NiFe2O4, CoFe2O4 and nFe2O4havebeen prepared by conventional ceramic technique. Starting materials of Analytical Reagent (AR) grade Nickel Oxide (NiO), inc Oxide (nO), Cobalt Oxide (Co3O4), and Iron Oxide (Fe2O3) with the desired stoichiometric compositions were used to synthesis the samples. Theas-prepared samples were made into circular shape pellets and their electrical properties were investigated in the relative humidity range of 40 RH% – 98RH%.The electrical resistance decreased with increase in relative humidity and the dc voltage and capacitance increased with increase in relative humidity. Sensitivity and sensitivity factor of the samples were examined for the application of humidity sensor.