Crystal Lattice Structures:	Creation Date: 13 Mar 2007
	Last Modified: 25 Jul 2008

The HoCoGa₅ 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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• This is the prototype for PuCoGa₅, an 18 K superconductor.
• 25 July 2008: Basis vector B₂ has Wyckoff position (1b), not (1c) as previously reported.

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• Prototype: HoCoGa₅
• Pearson Symbol: tP7
• Strukturbericht Designation: none
• Space Group: P4/mmm (Cartesian and lattice coordinate listings available)
• Reference: Villars and Calvert, Pearson's Handbook Vol. II, p 2403.
• Number: 123
• Other compounds with this structure: PuCoGa₅, most compounds of the form CoGa₅X and CoIn₅X, where X is an Lanthanide or Actinide.
• Primitive Vectors:

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

• Basis Vectors:

  B1	=		0		(Ho)	(1a)
  B2	=	½ A3	=	½ a Z	(Co)	(1b)
  B3	=	½ A1 + ½ A2	=	½ a X + ½ a Y	(Ga-I)	(1c)
  B4	=	½ A2 + z A3	=	½ a Y + z c Z	(Ga-II)	(4i)
  B5	=	½ A1 + z A3	=	½ a X + z c Z	(Ga-II)	(4i)
  B6	=	½ A2 - z A3	=	½ a Y - z c Z	(Ga-II)	(4i)
  B7	=	½ A1 - z A3	=	½ a X - z c Z	(Ga-II)	(4i)

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Structures indexed by: Strukturbericht Symbol Pearson Symbol Space Group Prototype

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