The A_c (alpha Np) Structure

Last modified 5 April 2001

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• 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.

Note: we've replaced the Np-II atoms by Uranium to get the figures shown above.

• Prototype: alpha Np
• Pearson Symbol: oP8
• Strukturbericht Designation: A_c
• Space Group: Pnma (Cartesian and lattice coordinate listings available)
• Number: 62
• Primitive Vectors:
  • A₁ = a X
  • A₂ = b Y
  • A₃ = c Z
• Basis Vectors:

  B1	=	+ x1 A1 + ¼ A2 + z1 A3	=	+ x1 a X + ¼ b Y + z1 c Z	(Np-I)	(4c)
  B2	=	- x1 A1 + ¾ A2 - z1 A3	=	- x1 a X + ¾ b Y - z1 c Z	(Np-I)	(4c)
  B3	=	(½ - x1) A1 + ¾ A2 + (½ + z1) A3	=	(½ - x1) a X + ¾ b Y + (½ + z1) c Z	(Np-I)	(4c)
  B4	=	(½ + x1) A1 + ¼ A2 + (½ - z1) A3	=	(½ + x1) a X + ¼ b Y + (½ - z1) c Z	(Np-I)	(4c)
  B5	=	+ x2 A1 + ¼ A2 + z2 A3	=	+ x2 a X + ¼ b Y + z2 c Z	(Np-II)	(4c)
  B6	=	- x2 A1 + ¾ A2 - z2 A3	=	- x2 a X + ¾ b Y - z2 c Z	(Np-II)	(4c)
  B7	=	(½ - x2) A1 + ¾ A2 + (½ + z2) A3	=	(½ - x2) a X + ¾ b Y + (½ + z2) c Z	(Np-II)	(4c)
  B8	=	(½ + x2) A1 + ¼ A2 + (½ - z2) A3	=	(½ + x2) a X + ¼ b Y + (½ - z2) c Z	(Np-II)	(4c)

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