Question: (a) (10 marks) Briefly explain why single crystal diffusion bar is better than polycrys- talline diffusion bar for measuring self-diffusivity? Does temperature have effects on

(a) (10 marks) Briefly explain why single crystal diffusion bar is

(a) (10 marks) Briefly explain why single crystal diffusion bar is better than polycrys- talline diffusion bar for measuring self-diffusivity? Does temperature have effects on the accuracy of self-diffusivity measurement? Hint: consider short-circuit diffusion. (b) (5 marks) Give 3 examples of fast diffusion path

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