Abstract
Gold islands deposited on yttria stabilized zirconia disperse into very small islands when the ceramic substrate activated by current in a flash experiment. It is postulated that the gold beads spread into a nanometer thick continuous metal layer, which fragments into islands on a very fine scale when the field is switched off and the substrate returns to its original state. The flash induced wetting is explained in terms of a recent report that zirconia develops metallic character at the onset of flash, but reverts quickly to the pure ionic state when the field is turned off.
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