Question

41-Which of the following is defined as "a mechanism that involves the interchange of an atom...

41-Which of the following is defined as "a mechanism that involves the interchange of an atom from a normal lattice position to an adjacent vacant lattice site"?

self-diffusion

Interstitial diffusion

Inter-diffusion

Vacancy diffusion

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Answer #2

Answer: Option 4) Vacancy diffusion

Substitutional diffusion occurs only if a vacancy is present. A vacancy is a “missing atom” in the lattice. If a vacancy is present, one of the adjacent atoms can move into the vacancy, creating a vacancy on the site that the atom has just left. This vacancy is filled by another adjacent atom creating a vacancy in it's own place, and so on.. Therefore diffusion of an atom is dependent on the presenceof an adjacent vacancy.

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