Hcp
From EVOCD
HCP Structure
The sample element is taken as Magnesium (Mg)
- Primitive Vectors:
A1 = ½ a X - ½ 31/2 a Y
A2 = ½ a X + ½ 31/2 a Y
A3 = c Z
- Basis Vector:
B1 = 1/3 A1 + 2/3 A2 + ¼ A3 (Mg) (2c)
B2 = 2/3 A1 + 1/3 A2 + ¾ A3 (Mg) (2c)
However in orthogonal unitcell:
A1 = a X
A2 = b Y
A3 = c Z
where b = Sqrt(3)a
And the Basis vectors:
B1 = 1/4 a 1/3 b 1/4 c
B2 = 3/4 a 5/6 b 1/4 c
B2 = 1/4 a 0 b 3/4 c
B2 = 3/4 a 1/2 b 3/4 c