Tetrahedrally Bonded Carbon with Four Member Rings

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 structure was proposed by Peter Schultz of Sandia Albuquerque, to show that four-member rings could exist in amorphous carbon. See his 1998 APS talk. The published reference is Peter A. Schultz, Kevin Leung, and E. B. Stechel, Phys. Rev. B 59, 733-741 (1999), available on-line at PRB .

• Prototype: C
• Pearson Symbol: oP8
• Space Group: I4/mmm (Cartesian and lattice coordinate listings available)
• Number: 139
• Other Elements with this Structure:
• Primitive Vectors:
  • A₁ = a X
  • A₂ = a Y
  • A₃ = ½ a X + ½ a Y + ½ c Z
• Basis Vectors [All atoms sit on the (8h) sites of the I4/mmm space group]
  • B₁ = + x A₁ + x A₂ = + x a X + x a Y
  • B₂ = - x A₁ + x A₂ = - x a X + x a Y
  • B₃ = - x A₁ - x A₂ = - x a X - x a Y
  • B₄ = + x A₁ - x A₂ = + x a X - x a Y

See these vectors in a better notation.

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