Electrical conductivity and oxygen sensing behavior of SrZr1-xFexO3-δ (x = 0-0.2) ceramics

SrZr1-xFexO3-δ (x = 0, 0.05, 0.1, 0.15 and 0.2) ceramics were prepared by solid state reaction method. Phase characterization and lattice parameter evaluation were done by X-ray diffraction studies. Relative concentrations of iron in various oxidation states in these compositions were estimated using Mössbauer spectroscopy. Electrical conductivities of these bulk samples were measured in various ambient and temperatures using AC Impedance spectroscopy. SrZr0.9Fe0.1O3-δ and SrZr0.8Fe0.2O3-δ have been found to exhibit significant change in electrical conductivity values between 100 and 21% O2 at around 673 K with considerable influence on conductivity towards the presence of moisture. The details of these results are discussed in this paper.