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An Optical In‐Situ Study of the Re‐Oxidation Kinetics of Calcia‐Stabilized Zirconia

The re-oxidation kinetics of strongly reduced single crystals of calcia-stabilized zirconia (black CSZ) have been investigated by an optical in-situ method at temperatures between PPS and 520°C. The kinetics obey a parabolic rate law. From the analysis of the optical results it follows that the parabolic rate constant, k p , is controlled by the ionic conductivity of the oxygen ions. The temperature dependence of k p can be represented by an Arrhenius-type equation with an activation energy of 1.05 eV. The nature of-the defect center associated with black CSZ is discussed in connection with its oscillator strength