Question

6. Carbon atoms are situated in octahedral sites in FCC iron, and, for BCC iron, in tetrahedral sites. Compute the radius r of an impurity atom that will just fit into a BCC tetrahedral site in terms of the atomic radius R of the host atom (without introducing lattice strains). A (100) face of a BCC unit cell and the (100) face of an FCC unit cell are shown with a impurity atom in tetrahedral site and octahedral site respectively 7. On the basis of this result and the answer to Problem 6, explain why a higher concentration of carbon will dissolve in FCC iron than in iron that has a BCC crystal structure. (Compare radius)

          6. Carbon atoms are situated in octahedral sites in FCC iron,
and, for BCC iron, in tetrahedral sites. Compute the radius r of
an impurity atom that will just fit into a BCC tetrahedral site in
terms of the atomic radius R of the host atom (without
introducing lattice strains).
A (100) face of a BCC unit cell and the (100) face of an
FCC unit cell are shown with a impurity atom in tetrahedral
site and octahedral site respectively
7. On the basis of this result and the answer to Problem 6,
explain why a higher concentration of carbon will dissolve in
FCC iron than in iron that has a BCC crystal structure. (Compare
radius)

6. Carbon atoms are situated in octahedral sites in FCC iron,
and, for BCC iron, in tetrahedral sites. Compute the radius r of
an impurity atom that will just fit into a BCC tetrahedral site in
terms of the atomic radius R of the host atom (without
introducing lattice strains).
A (100) face of a BCC unit cell and the (100) face of an
FCC unit cell are shown with a impurity atom in tetrahedral
site and octahedral site respectively
7. On the basis of this result and the answer to Problem 6,
explain why a higher concentration of carbon will dissolve in
FCC iron than in iron that has a BCC crystal structure. (Compare
radius)

Added by Michael F.

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