The S₂ Si (C42) Structure

Last modified 13 April 2001

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• see the structure from several perspectives;
• examine the structure with an external viewer; or
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• Prototype: S₂Si
• Pearson Symbol: oI12
• Strukturbericht Designation: C42
• Space Group: Ibam (Cartesian and lattice coordinate listings available)
• Number: 72
• Primitive Vectors:
  • A₁ = - ½ a X + ½ b Y + ½ c Z
  • A₂ = + ½ a X - ½ b Y + ½ c Z
  • A₃ = + ½ a X + ½ b Y - ½ c Z
• Basis Vectors: + ¼ A₂ - ¼ A₂

  B1	=	+ ¼ A1	=	+ ¼ c Z	(4a)	(Si)
  B2	=	- ¼ A1	=	- ¼ c Z	(4a)	(Si)
  B3	=	+ y A1 + x A2 + (x+y) A3	=	+ x a X + y b Y	(8j)	(S)
  B4	=	- y A1 - x A2 - (x+y) A3	=	- x a X - y b Y	(8j)	(S)
  B5	=	(½ + y) A1 + (½ - x)A2 + (y-x) A3	=	- x a X + y b Y + ½ c Z	(8j)	(S)
  B6	=	(½ - y) A1 + (½ + x)A2 + (x-y) A3	=	+ x a X - y b Y + ½ c Z	(8j)	(S)

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