Classify the following as either (1) a substitutional impurity (2) an interstiti
ID: 1999485 • 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 monatomc basis for FCC and BCC structures)
1) A Au crystal (FCC structure) with a Pd atom at (a/2, a/2, a/2) in one of its unit cells
2) A Si (diamon) structure with a Cu atom at (a/2, a/2, a/2) in on 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)
3)An Al (FCC) structure with no at atom at (a/2, a/2, a/2) in onoe of its unit cells.
Explanation / Answer
1) Substitutional Impurity
3) A vacancy