The B11 Structure

Last modified 5 April 2001

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A lattice with tetragonal symmetry. When c = 2 a, x₁ = 1/8, and x₂ = 5/8, the atoms are on the sites of a body-centered cubic lattice. If, on the other hand, c = 2 sqrt(2) a, with the same x_i, the atoms are on the site of a face-centered cubic lattice. This is the phase that Lu et al. refer to as ``Z2''.

• Prototype: Gamma CuTi
• Pearson Symbol: tP4
• Strukturbericht Designation: B11
• Space Group: P4/nmm (Cartesian and lattice coordinate listings available)
• Number: 129
• Other Compounds with this Structure: AuCu, AlRe
• Primitive Vectors:
  • A₁ = a X
  • A₂ = a Y
  • A₃ = c Z
• Basis Vectors:
  • B₁ = - ¼ A₁ + ¼ A₂ + x₁ A₃ = - ¼ a X + ¼ a Y + x₁ c Z (Cu)
  • B₂ = + ¼ A₁ - ¼ A₂ - x₁ A₃ = + ¼ a X - ¼ a Y - x₁ c Z (Cu)
  • B₁ = - ¼ A₁ + ¼ A₂ + x₂ A₃ = - ¼ a X + ¼ a Y + x₂ c Z (Ti)
  • B₂ = + ¼ A₁ - ¼ A₂ - x₂ A₃ = + ¼ a X - ¼ a Y - x₂ c Z (Ti)

See these vectors in a better notation.

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