The gamma Se (A8) 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.

When x = 1/3 this reduces to the A_i (beta Po) or A10 (alpha Hg) structure. If, in addition, c = 6^1/2 a, then the structure becomes fcc (A1).

• Prototype: gamma Se
• Pearson Symbol: hP3
• Strukturbericht Designation: A8
• Space Group: P3₁21 (Cartesian and lattice coordinate listings available)
• Number: 152
• Other Systems with this Structure: Te, SeTe, Se₃Te
• Primitive Vectors:
  • A₁ = ½ a X - ½ 3^1/2 a Y
  • A₂ = ½ a X + ½ 3^1/2 a Y
  • A₃ = c Z

• Basis Vectors:
  • B₁ = x A₁ + 1/3 A₃ = ½ a x X - ½ 3^1/2 a x Y + 1/3 c Z
  • B₂ = x A₂ + 2/3 A₃ = ½ a x X + ½ 3^1/2 a x Y + 2/3 c Z
  • B₃ = -x A₁ - x A₂ = - a x X

See these vectors in a better notation.

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