The B19 (AuCd)
Structure
Last modified 5 April
2001
You can now
- When a = b = c, x1 = ¼, and x2 = ¾ the
atoms are on the sites of a face centered
cubic lattice.
- When a = c, x1 = ¼, and x2 = ¾ the
system reduces to the L1_0 (AuCu) structure.
-
When a/b = (8/3)2/3, c/b = 31/2,
x1 = 5/6, and x2 = 1/3, the atoms are on the
sites of an hcp lattice.
-
Finally, though it is not obvious from my choice of directions, when
x2 = ½ + x1 the atoms are at the positions
of the alpha Uranium lattice.
Thanks to Thomas Adler of DOE for pointing out these relationships.
- Prototype: AuCd
- Pearson Symbol: oP4
- Strukturbericht Designation: B19
- Space Group: Pmma (Cartesian and lattice coordinate listings
available)
- Number: 51
- Other Compounds with this Structure: AuTi, CdMg, IrMo, IrW,
MoRh, NbRh, PdTi, PtTi, PtV
- Primitive Vectors:
- A1 = a X
- A2 = b Y
- A3 = c Z
- Basis Vectors:
- B1 = + ¼ A1 +
x1 A3 = + ¼ aX +
x1 cZ (Cd)
- B2 = - ¼ A1 -
x1 A3 = - ¼ aX -
x1 cZ (Cd)
- B3 = + ¼ A1 + ½
A2 + x2 A3 = + ¼
aX + ½ bY + x2 cZ (Au)
- B4 = - ¼ A1 - ½
A2 - x2 A3 = - ¼
aX - ½ bY - x2 cZ (Au)
Go back to the Cubic Close Packed Structure
page.
Go back to Crystal Lattice Structure
page.
Structures indexed by:
