Write the relastion between atomin radius and edge length of cubic cell unit for simple cubic unit cell
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r=a2r=a2‾‾√r=3‾√4ar=3a2
r=3‾√4a
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The Solid States , Class-12
Q) Write the relation between atomic radius(r) and edge length(a) of cubic unit cell for simple cubic unit cell, Face centered cubic unit cell, body centered cubic unit cell.
A: Simple/Primitive cubic unit cell
- Rank of unit cell = 1
- r = a÷2 , a = 2r
Face centered cubic unit cell
- Rank of unit cell = 4
- r = √2a÷4 , a = 4r÷√2
Body centered cubic unit cell
- Rank of unit cell = 2
- r = √3a÷4 , a = 4r÷√3
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