The A6 Face-Centered Tetragonal Lattice

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.

Despite its appearance, this is a face-centered tetragonal (fct) structure, a distortion of the fcc structure and the monatomic analog of the L1₀ structure. In addition, this structure has exactly the same symmetry as the A_a structure. In the A6 structure, c/a is near the fcc ratio of Sqrt[2], while in the A_a structure, c/a is near the bcc ratio of 1.

• Prototype: In
• Pearson Symbol: tI2
• Strukturbericht Designation: A6
• Space Group: I4/mmm (Cartesian and lattice coordinate listings available)
• Number: 139
• Other Elements with this Structure: Pa (See above)
• Primitive Vectors:
  • A₁ = aX
  • A₂ = aY
  • A₃ = ½ a X + ½ a Y + ½ c Z

• Basis Vector:
  • B₁= 0

See these vectors in a better notation.

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