Solid state oxygen kinetics in Er2O3 stabilized Bi2O3

This paper reports the conductivity and mechanism of oxygen-ion transport in a nominal 20 mole % erbia-stabilized bismuth oxide (ESB) investigated. The conductivity was studied using AC impedance spectroscopy. Complex impedance plots were obtained over the frequency range 20 Hz to 1 MHz and over the temperature range 200 degrees C to 750 degrees C. An equivalent circuit for oxygen-ion transport was determined from the complex impedance results. These results indicate that the oxygen-ion transport process can be modeled by a resistance in series with a parallel circuit. Two activation energies were observed, with the high temperature activation process dominated by the series resistance and the low temperature activation process dominated by the parallel component