The diffusion coefficient for Cr+3 in Cr2O3 is 6 ×

The diffusion coefficient for Cr+3 in Cr2O3 is 6 × 10-15 cm2/s at 727 °C and 1 × 10-9 cm2/s at 1400 °C. Calculate
(a) The activation energy; and
(b) The constant D0.

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