The A17 (black Phosphorus) Crystal 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.

The structure here is identical to alpha Gallium (A11) and I₂ (A14). The only difference is the spacing between the atoms.

• Prototype: P (black)
• Pearson Symbol: oC8
• Strukturbericht Designation: A17
• Space Group: Cmca (Cartesian and lattice coordinate listings available)
• Number: 64
• Primitive Vectors:
  • A₁ = ½ a X - ½ b Y
  • A₂ = ½ a X + ½ b Y
  • A₃ = c Z
• Basis Vectors:
  All atoms are on (8f) sites:
  • B₁ = - u A₁ + u A₂ + v A₃ = + u b Y + v c Y
  • B₂ = + u A₁ - u A₂ - v A₃ = - u b Y - v c Y
  • B₃ = - (½ + u) A₁ + (½ + u) A₂ + (½ - v) A₃ = (½ + u) b Y + (½ - v) c Y
  • B₄ = - (½ - u) A₁ + (½ - u) A₂ + (½ + v) A₃ = (½ - u) b Y + (½ + v) c Y

See these vectors in a better notation.

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