Solid StateHard
Question
The co-ordination number of fcc structure for metals is 12, since
Options
A.each atom touches 4 others in same layer, 3 in layer above and 3 in layer below.
B.each atom touches 4 others in same layer, 4 in layer above and 4 in layer below.
C.each atom touches 6 others in same layer, 3 in layer above and 3 in layer below.
D.each atom touches 3 others in same layer, 6 in layer above and 6 in layer below.
Solution
Fcc can be viewed in two following ways -
(i) Planes along the faces (and parallel to it) of the unit cell.
⇒ Each atom touches 4 in same layer, 4 in layer above and 4 in layer bellow it.
(ii) Planes along closest packed spheres → each atom touches 6 atom in same layer, 3 in layer above and 3 in layer below it.
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