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Flash in Argon Atmosphere Yields Electronically Conducting Yttria‐stabilized Zirconia at Ambient Temperature

JOURNAL OF THE AMERICAN CERAMIC SOCIETY(2023)

Univ Colorado Boulder

Cited 6|Views10
Abstract
This is the second report on the retention of electronic conductivity in yttria-stabilized zirconia at room temperature after cooling down from the state of flash . In the first report, the specimens (which were flashed in air) were quenched by in-flash immersion into liquid nitrogen. Now we show that if the specimens are flashed in Ar in a glove box (O-2 < 1 ppm), then they remain electronic conductors under nominal cooling. Indeed, the conductivity of the Ar-flashed specimens is higher than the conductivity of LN2-quenched samples. In both instances, their conductivity increases with flash current. In contrast, specimens flashed in air, and then air-cooled, become insulating akin to their original condition. We propose a possible pathway for such a reaction. In addition, we report measurements of the interface resistance at the anode and the cathode by the four-point technique. In air, the resistance at anode is higher than at the cathode, and the sum of the interface resistances is about one half of the total end-to-end resistance.
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Key words
electronic conductivity,flash sintering,inert atmosphere,liquid nitrogen quench
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