Describe the bcc unit cell and hence determine the packing fraction
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Bcc unit cell can be described as,,,
___ if an atom present at the body centre, it is not shared by any other unit cell. so that one atom completely belongs to same unit cell.
packing fraction :---__
packing fraction, the fraction of volume occupied by the spheres in the structure.
✴️ Packing fraction = V(sphere) / V(unit cell)
= 2×4/3 p R3 / (4/sqrt(3) R3)
= 3 p / 8 = 0.6802.
___ if an atom present at the body centre, it is not shared by any other unit cell. so that one atom completely belongs to same unit cell.
packing fraction :---__
packing fraction, the fraction of volume occupied by the spheres in the structure.
✴️ Packing fraction = V(sphere) / V(unit cell)
= 2×4/3 p R3 / (4/sqrt(3) R3)
= 3 p / 8 = 0.6802.
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