The ratio of a number of atoms present in a simple cubic, body-centered cubic and face-centered cubic structure are, respectively:
8 : 1 : 6
1 : 2 : 4
4 : 2 : 1
4 : 2 : 3
No. of atoms(z) for simple cubic unit cell -
Lattice points: at corners
For simple cubic (SC), z=1
No. of atoms(z) for face centered unit cell -
Lattice points: at corners and face centers of unit cell.
For face centered cubic (FCC), z=4.
z for body centered unit cell -
Lattice points: at corners and body center of unit cell.
For body centered cubic (BCC), z=2
In SC- lactic point present only at corner =
In BCC batting point present at corner + Body centered =
In FCC lattice point present at corner + face centre =
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