Crystal Lattice Structures:	Creation Date: 10 Apr 2002
	Last Modified:  8 Mar 2005

The Hypothetical cI16 Ferrite 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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• Ferrite is steel with a bcc structure. This structure represents one possible ordering which might be found in an Fe-Ni-Cr steel. Note that it is not meant to represent a real steel.
• If we replace the Cr atoms by Ni, this becomes the CsCl (B2) structure. If we replace both the Cr and Ni atoms by Fe, we get the bcc (A2) structure. In either case, a_bcc/B2 = ½ a.
• If we replace the Cr atoms by Fe, this becomes the D3/D5 structure of Lu et al.

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• Prototype: CrFe₄Ni₃ (hypothetical)
• Pearson Symbol: cI16
• Space Group: Im3m (Cartesian and lattice coordinate listings available)
• Number: 229
• Primitive Vectors:

  A1	=	-½ a X + ½ a Y + ½ a Z
  A2	=	+ ½ a X - ½ a Y + ½ a Z
  A3	=	+ ½ a X + ½ a Y - ½ a Z

• Basis Vectors:

  B1	=		0		(Cr)	(2a)
  B2	=	+ ½ A1 + ½ A2 + ½ A3	=	+ ¼ a X + ¼ a Y + ¼ a Z	(Fe)	(8c)
  B3	=	+ ½ A1	=	- ¼ a X + ¼ a Y + ¼ a Z	(Fe)	(8c)
  B4	=	+ ½ A2	=	+ ¼ a X - ¼ a Y + ¼ a Z	(Fe)	(8c)
  B5	=	+ ½ A3	=	+ ¼ a X + ¼ a Y - ¼ a Z	(Fe)	(8c)
  B6	=	+ ½ A2 + ½ A3	=	½ a X	(Ni)	(6b)
  B7	=	+ ½ A1 + ½ A3	=	½ a Y	(Ni)	(6b)
  B8	=	+ ½ A1 + ½ A2	=	½ a Z	(Ni)	(6b)

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Structures indexed by: Strukturbericht Symbol Pearson Symbol Space Group Prototype

Current URL: http://cst-www.nrl.navy.mil/ lattice/struk/fsci16.html This page was created at the Naval Research Laboratory Center for Computational Materials Science Send comments and corrections to lattice@dave.nrl.navy.mil (Privacy Advisory)