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← ScienceWhich outcome occurs when a high voltage is applied to a solid ionic conductor like yttria-stabilized zirconia (YSZ)?
A)Electrochemical reactions causing phase decomposition✓
B)Increased electronic conductivity overpowering the ionic
C)Thermal runaway due to oxygen recombination
D)Mechanical cracking from space charge buildup
💡 Explanation
When high voltage is applied, electrochemical reactions occur at the grain boundaries in the ionic conductor because the overpotential drives normally unfavorable reactions that decompose the YSZ phase. Therefore, phase decomposition occurs, rather than the alternatives which would each require other concurrent factors for activation.
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