The D2_d (CaCu₅) Structure

Last modified 4 June 2001

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• Prototype: CaCu₅
• Pearson Symbol: hP6
• Strukturbericht Designation: D2_d
• Space Group: P6/mmm (Cartesian and lattice coordinate listings available)
• Number: 191
• Other systems with this structure: Au₅Er, Au₅Sr, Ag₃Al₂La, Ag₅Ba, CePt₅, Co₅Sm, Co₅Tb, Co₅Y, EuZn₅, GdRh₅, Ir₅Nd, SmZn₅, many others
• Primitive Vectors:
  • A₁ = ½ a X - ½ 3^½ a Y
  • A₂ = ½ a X + ½ 3^½ a Y
  • A₃ = c Z
• Basis Vectors:

  B1 =		0		(1a)	(Ca)
  B2 =	1/3 A1 + 2/3 A2	=	½ a X  + (12)-½ a Y	(2c)	(Cu-I)
  B3 =	2/3 A1 + 1/3 A2	=	½ a X  - (12)-½ a Y	(2c)	(Cu-I)
  B4 =	½ A1 + ½ A3	=	¼ a X  - ¼ 3-½ a Y + ½ c Z	(3g)	(Cu-II)
  B5 =	½ A2 + ½ A3	=	¼ a X  + ¼ 3-½ a Y + ½ c Z	(3g)	(Cu-II)
  B4 =	½ A1 + ½ A2 + ½ A3	=	½ a X  + ½ c Z	(3g)	(Cu-II)

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