Question

difference between hcp and ccp

Answer 1

1. Stacking Sequence of Layers
-HCP layers cycle between two equivalent shifted layers in an ABABAB sequence
-CCP layers cycle among three different layers in an ABCABC sequence
Similarities and Difference Between the FCC and HCP Structure
2. Shape of the Unit Cells
- HCP structures have hexagonal unit cells characterized by a diamond shaped or hexagonal base with sides of equal length
-CCP structures have cubic unit cells
Hexagonal Unit Cell
3. Volume of Unit Cells
-HCP unit cells have a volume which can be calculated with the equation V=24*sqrt(2)*r^3 in which r = the atomic radius
-CCP unit cells have a volume which can be calculated with the equation V=8*sqrt(8)*r^3 in which r = the atomic radius
Hexagonal Close Packing
4. Number of Atoms per Unit Cell
-HCP unit cells contain 6 atoms
-CCP unit cells contain 4 atoms

Answer 2

Explanation:

1stly, CCP...stands for centred cubic unit cell and

hcp stands for hexagonal close packaging unit cell.

2ndly, CCP have ABC - ABC arrangement and it has cubic close packaging (CCP).

3rdly, both have sme coordination no = 12 .

4thly, the also both have same packaging efficiency that is = 74%.

5thly, particles inside FCC unit cell is = 4 and hcp inside = 6.