1--Number of atoms present per unit cell to end face centred cubic unit cell are?
2-- calculate total number of atoms present per unit cell if one atom is present on each corner while two atoms are present on each body diagonal
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The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell
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Calculate the number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each body diagonal.
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Hint:As we know, the atoms in a cubic based unit cell having one atom on each corner means there are 8 atoms.
The contribution of corner atoms in each cubic cell is y8.
Therefore,
Total no. of atoms =8×18=1 on corner
There are 4 diagonal in a cube and the atoms in a body diagonal are complete within the cubic cell.
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