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classify the following as either 1). a substitutional impurity 2) an interstitia

ID: 915005 • Letter: C

Question

classify the following as either 1). a substitutional impurity 2) an interstitial impurity 3).a vacancy 4) a self-interstitial or 5) not a defect Assume a monatomic basis for FCC and BCC structure)

a). A Au crystal (FCC structure) with a Pd atom at (a/2,a/2,a/2) in one of its unit cells.

b).A Si(diamond)structure with Cu atom at(a/2,a/2,a/2) in one of its unit cells (assume that the basis atoms are chosen to lie at 0 and at(a/4)(x+y+z)relative to each point of the FCC lattice)

(c) An Al(FCC)structure with no atom at (a/2,a/2,a/2)in one of its unit cells.

Explanation / Answer

ANSWER

(a) It is a substitutional impurity. The coordinates (a/2,a/2,a/2) correspond to atoms at faces.

(b) It represents an interstitial impurity

(c) It represents a vaccancy.

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