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In this research the electrochemical reduction of 3YSZ was investigated invarious atmospheres with different oxygen partial pressures under an electricfield of 25 V/cm at an environmental temperature of 800 {\deg}C. At a certainoxygen partial pressure insufficient incorporation of oxygen in the sample ledto electrochemical reduction of YSZ which shows two clearly distinguishablestates. First, greying of the material without a significant change inproperties was detected which then transitioned into a second stage where afundamental phase transition in the material happened within seconds fromtetragonal 3YSZ towards FCC rocksalt ZrO or ZrON, dependent on the atmosphere.This phase transition is accompanied by blackening of the material, suddenincrease in electrical conductivity, current concentration, and an obviouschange in Raman spectrum.

Investigation about the electrochemical reduction in 3YSZ, related phase transition and consequences