The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10^-16 m2S-1 and it is 1.94 x 10^-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
Correct answer: C. 230
- A. 130
- B. 180
- C. 230
- D. 250
Explanation
Using ln(D₂/D₁) = (E/R)(1/T₁ − 1/T₂), the data give E ≈ 230 kJ/mol. The very large increase in diffusivity over this temperature interval reflects the Arrhenius temperature dependence.
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