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Which mechanism facilitates high-temperature solid-state conduction in stabilized zirconia?

A)Vacancy diffusion across oxygen ions
B)Electronic tunneling at grain boundaries
C)Interstitial migration within zirconium cations
D)Surface conduction along moisture films

💡 Explanation

High-temperature conductivity occurs via vacancy diffusion, since dopants like yttria create oxygen vacancies facilitating ionic transport. This dominates at elevated temperatures because the increased thermal energy overcomes energy barriers for ion movement, therefore solid-state ionic conduction occurs rather than electronic or surface effects.

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