Crystal Lattice Structures:	Creation Date:  6 Oct 2002
	Last Modified: 21 Apr 2009

The HgCl₂ (C25) Structure

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.
• visualize the structure (Uses the JMOL Applet)

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• Strukturbericht Vol II gives the coordinates of the basis vectors in the orientation Pmcn. This is the same space group as Pnma, differening only by a rotation about the <111> axis. We've done that rotation here so that we can show the space group as Pnma.
• Correction (19 Feb 2003): There are 12 atoms in the primitive orthorhombic cell, so the Pearson Symbol is oP12, not oP16.

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• Prototype: HgCl₂
• Pearson Symbol: oP12
• Strukturbericht Designation: C25
• Space Group: Pnma (Cartesian and lattice coordinate listings available)
• Number: 62
• Reference: Strukturbericht, Vol II, p. 19.
• Other compounds with this structure: FeO₂ (Goethite)
• Primitive Vectors:

  A1	=	a X
  A2	=	b Y
  A3	=	c Z

• Basis Vectors:

  B1	=	+ x1 A1 + ¼ A2 + z1 A3	=	+ x1 a Y + ¼ b Y + z1 c Z	(Hg)	(4c)
  B2	=	+ (½ + x1) A1 + ¼ A2 + (½ - z1) A3	=	+ (½ + x1) a Y + ¼ b Y + (½ - z1) c Z	(Hg)	(4c)
  B3	=	- x1 A1 - ¼ A2 - z1 A3	=	- x1 a Y - ¼ b Y - z1 c Z	(Hg)	(4c)
  B4	=	+ (½ - x1) A1 - ¼ A2 + (½ + z1) A3	=	+ (½ - x1) a Y - ¼ b Y + (½ + z1) c Z	(Hg)	(4c)
  B5	=	+ x2 A1 + ¼ A2 + z2 A3	=	+ x2 a Y + ¼ b Y + z2 c Z	(Cl-I)	(4c)
  B6	=	+ (½ + x2) A1 + ¼ A2 + (½ - z2) A3	=	+ (½ + x2) a Y + ¼ b Y + (½ - z2) c Z	(Cl-I)	(4c)
  B7	=	- x2 A1 - ¼ A2 - z2 A3	=	- x2 a Y - ¼ b Y - z2 c Z	(Cl-I)	(4c)
  B8	=	+ (½ - x2) A1 - ¼ A2 + (½ + z2) A3	=	+ (½ - x2) a Y - ¼ b Y + (½ + z2) c Z	(Cl-I)	(4c)
  B9	=	+ x3 A1 + ¼ A2 + z3 A3	=	+ x3 a Y + ¼ b Y + z3 c Z	(Cl-II)	(4c)
  B10	=	+ (½ + x3) A1 + ¼ A2 + (½ - z3) A3	=	+ (½ + x3) a Y + ¼ b Y + (½ - z3) c Z	(Cl-II)	(4c)
  B11	=	- x3 A1 - ¼ A2 - z3 A3	=	- x3 a Y - ¼ b Y - z3 c Z	(Cl-II)	(4c)
  B12	=	+ (½ - x3) A1 - ¼ A2 + (½ + z3) A3	=	+ (½ - x3) a Y - ¼ b Y + (½ + z3) c Z	(Cl-II)	(4c)

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Structures indexed by: Strukturbericht Symbol Pearson Symbol Space Group Prototype

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