Question: (a) Compute the radius r of an impurity atom that will just fit into an FCC octahedral site in terms of the atomic radius R

(a) Compute the radius r of an impurity atom that will just fit into an FCC octahedral site in terms of the atomic radius R of the host atom (without introducing lattice strains).

(b) Repeat part (a) for the FCC tetrahedral site.

(You may want to consult Figure 4.3a.)

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