The D019
(Ni3Sn) Structure
Last modified 5 April
2001
You can now
Thanks are due to Thomas A. Adler of DoE's Albany Research Center
for correcting the pictures and the structural information.
When the internal parameter x = 1/6 exactly then the
atoms are on the sites of an A3 (hcp) lattice
with ahcp = ½ a and
chcp = c.
- Prototype: Ni3Sn
- Pearson Symbol: hP8
- Strukturbericht Designation: D019
- Space Group: P63/mmc (Cartesian and lattice coordinate listings
available)
- Number: 194
- Other Compounds with this Structure: Ti3Sn,
Ti3Al, Mn3Sn, Cd3Mg,
Mg3In, Hg3Y
- 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
(Sn) (2c)
- B2 = 2/3 A1 + 1/3
A2 + ¾ A3 = ½ a
X - ½ 3-1/2 a Y + ¾ c Z
(Sn) (2c)
- B3 = + x A1 + 2x
A2 + ¼ A3 = + 3/2 a x
X + ½ 31/2 a x Y + ¼ c Z
(Ni) (6h)
- B4 = - 2x A1 - x
A2 + ¼ A3 = - 3/2 a x
X + ½ 31/2 a x Y + ¼ c Z
(Ni) (6h)
- B5 = + x A1 - x
A2 + ¼ A3 = -
31/2 a x Y + ¼ c Z (Ni)
(6h)
- B6 = - x A1 - 2x
A2 + ¾ A3 = - 3/2 a x
X - ½ 31/2 a x Y + ¾ c Z
(Ni) (6h)
- B7 = + 2x A1 + x
A2 + ¾ A3 = + 3/2 a x
X - ½ 31/2 a x Y + ¾ c Z
(Ni) (6h)
- B8 = - x A1 + x
A2 + ¾ A3 = +
31/2 a x Y + ¾ c Z (Ni)
(6h)
In Ni3Sn and Ti3Al the internal parameter x
is approximately 5/6.
Go back to the Hexagonal Close Packed structures
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