Question

4 differences between hcp and ccp arrangement

Answer 1

Answer:

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

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

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

Number of Atoms per Unit Cell

-HCP unit cells contain 6 atoms

-CCP unit cells contain 4 atoms

Answer 2

4 differences are :-

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.

2. Shape of unit cells

-hcp structures have hexagonal unit cells characterised by hexagonal base or diamond shaped with sides of equal length

-Ccp structures have cubic unit cells

3.Volume of Unit cells

-hcp unit cells have volume which can be calculated by the equation V=24*sqrt(2)*r^3 in which r= atomic radius

-Ccp unit cells have volume which can be calculated by the equation V=8*sqrt(8)*r^3 in which r= atomic radius

4.No. Of atoms per unit cell

-hcp unit cells contain 6 atoms

-Ccp unit cells contain 4 atoms