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sri valli Grade:
        

a metal crystallizes into two cubic phases,fcc and bcc.whose unit cell lengths are 4.0 and 3.0 angstroms respectively.the ratio of densities of fcc and bcc is

7 years ago

Answers : (1)

Anurag Kishore
37 Points
										

Hi,


Use the eqn


$ = ZM/(a3 Na)


$ = density


z = rank (no. of atoms per unit cell)


a = unit cell length


Na = Avogadro number


$1/$2 = z1 a23 / z2 a13


         = 4 * 33 / 2 * 43


          = 27 / 32


 


because there are 4 atoms in fcc and 2 atoms in bcc


Thanks


Anurag


 

7 years ago
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