Transition to Electronic Conduction at the Onset of Flash in Cubic Zirconia
15 Pages Posted: 8 Jul 2019 Publication Status: Accepted
Abstract
We report in-situ measurements of impedance spectroscopy during flash experiments with single crystals of cubic-yttria stabilized zirconia, conducted in ambient air at 300 °C to 700 °C under a direct current electric field. Platinum electrodes transition from blocking to non-blocking behavior just before the onset of flash, indicating a transition to partial electronic conductivity during the incubation period. Even though the conductivity continued to increase with temperature the electron transport remained at a plateau of 0.25. This result has ramifications not only in the fundamental understanding but also in technological significance of the flash phenomenon.
Keywords: flash, single crystal zirconia, incubation time, mixed ionic and electronic conductivity
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