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5. (15pts) It is determined that oxygen vacancy concentration in a ceramic electrolyte is 4 * 1021 /cm3 and it will not change with temperature.

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5. (15pts) It is determined that oxygen vacancy concentration in a ceramic electrolyte is 4 * 1021 /cm3 and it will not change with temperature. If oxygen ion conductivities at 200 C and 600 C are 107S/cm and 102 S/cm, respectively. Please determine the activation energy (in eV), and conductivity at 25 C (S/cm), and diffusion coefficient at 600 C (cm-/s)

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