The diffusion coefficient for O-2 in Cr2O3 is 4 ×

The diffusion coefficient for O-2 in Cr2O3 is 4 × 10-15 cm2 / s at 1150 °C and 6 × 10-11 cm2/s at 1715 °C. Calculate
(a) The activation energy; and
(b) The constant D0.

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