The CuAu (L1₀) Structure

Last modified 5 April 2001

You can now

• see the structure from several perspectives;
• examine the structure with an external viewer; or
• download the coordinates of the atoms in these pictures in XYZ format.

This is a tetragonal distortion of the fcc structure. The atoms are at the positions of a face centered cubic lattice when c = a. Indium (A6) has a related structure. The B19 (AuCd) structure reduces to L1₀ in certain cases, as does the L6₀ (CuTi₃) structure.

Note that Pearson's Handbook sometimes assigns a Pearson symbol of tP4, rather than tP2. Since Pearson's Handbook also says CuTi₃ is in the CuAu structure, I'll use my best judgment.

• Prototype: AuCu
• Pearson Symbol: tP2
• Strukturbericht Designation: L1₀
• Space Group: P4/mmm (Cartesian and lattice coordinate listings available)
• Number: 123
• Other Compounds with this Structure: TiAl, NlIn
• Primitive Vectors:
  • A₁ = ½ a X - ½ a Y
  • A₂ = ½ a X + ½ a Y
  • A₃ = c Z
• Basis Vectors:
  • B₁ = 0   (Au)   (1a)
  • B₂ = ½ A₁ + ½ A₂ + ½ A₃ = ½ a X + ½ c Z   (Cu)   (1d)

See these vectors in a better notation.

Go back to the Cubic Close Packed Structure page.

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