The D018
(Na3As) Structure
Last modified 5 April
2001
You can now
- Prototype: Na3As
- Pearson Symbol: hP8
- Strukturbericht Designation: D018
- Space Group: P63/mmc (Cartesian and lattice coordinate listings
available)
- Number: 194
- Primitive Vectors:
- A1 = ½ a X - ½
31/2 a Y
- A2 = ½ a X + ½ 31/2
a Y
- A3 = c Z
- Basis Vectors (with International Crystallographic Tables
site designations):
- B1 = 1/3 A1 + 2/3
A2 + ¼ A3 = ½ a
X + ½ 3-1/2 a Y + ¼ c Z
(As) (2c)
- B2 = 2/3 A1 + 1/3
A2 + ¾ A3 = ½ a
X - ½ 3-1/2 a Y + ¾ c Z
(As) (2c)
- B3 = + ¼ A3 = + ¼
c Z (Na-I) (2b)
- B4 = + ¾ A3 = + ¾
c Z (Na-I) (2b)
- B5 = 1/3 A1 + 2/3
A2 + z A3 = ½ a X +
½ 3-1/2 a Y + z c Z (Na-II)
(4f)
- B6 = 2/3 A1 + 1/3
A2 - z A3 = ½ a X -
½ 3-1/2 a Y - z c Z (Na-II)
(4f)
- B7 = 2/3 A1 + 1/3
A2 + (½ + z) A3 = ½ a
X - ½ 3-1/2 a Y + (½ + z) c
Z (Na-II) (4f)
- B8 = 1/3 A1 + 2/3
A2 + (½ - z) A3 = ½ a
X + ½ 3-1/2 a Y + (½ - z) c
Z (Na-II) (4f)
In Na3As the internal parameter z is approximately
7/12.
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