Page 33 - Microsoft PowerPoint - lecture1.ppt

2.2 Simple close packed structures (metals)

Calculation of space filling – example CCP

Volume occupied by atoms (spheres)
Space filling =
Volume of the unit cell

4 r 2a

4 
 r 3

V (cell ) a 3  
 2 

4
ZV (sphere )  3
4 r
3

 
 4 3 
4 r
 3  2

spacef .  3   . 0 74

 r
 4   6

  

 2  