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

# The Hypothetical cI16 Ferrite Structure

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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, abcc/B2 = ½ a.
• If we replace the Cr atoms by Fe, this becomes the D3/D5 structure of Lu et al.

• 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: This is a mirror of an old page created at theNaval Research LaboratoryCenter for Computational Materials ScienceThe maintained successor is hosted at http://www.aflowlib.org/CrystalDatabase/ and published as M. Mehl et al., Comput. Mater. Sci. 136 (Supp.), S1-S828 (2017).