Abstract
The electric conductivity of zirconia in the steady stage of flash sintering is measured under various current densities. We find that the steady stage conductivity (σs) is higher than the normal conductivity (σn) measured at non-flashing conditions, even Joule heat is considered. The higher conductivity is ascribed to the increase in charge carrier concentration. The difference between σs and σn is then used to estimate the oxygen vacancy concentration. It is found that the concentration increases with increasing current density at beginning and then decreases with further increasing current density. A speculative explanation is proposed to account for this phenomenon.
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