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How come fcc unit cell and hcp structure are similar


Sohail Khan 15th Nov, 2018
Answer (1)
priyaankasarkar Student Expert 16th Nov, 2018

Dear Sohail, FCC or the Face centres cubic and Hexagonal close packed structures both have a packing factor of 0.74, consists of closely packed planes of atoms and have a coordination number of 12. That is where the similarities end. The main difference between these 2 is the stacking sequence. The HCP layers cycle among 2 equal shifted  positions whereas with FCC, it is 3 positions. With HCPH each sphere contacts with 6 neighboured spheres.  The fcc metals are ductile than the HCP metals. 

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