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Important definition in crystallography

  1. Feb 7, 2010 #1

    kelvin490

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    Can anyone tell me what's the definition of close packed plane in lattice structure? How can I be sure the close packed plane in FCC structure is (111) ?
     
  2. jcsd
  3. Feb 7, 2010 #2

    Astronuc

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    The close packed plane has the smallest (minimum) interatomic spacing.

    Compare the atomic spacing of the cube edge (edge of face) with face diagonal and cube diagonal.

    This might help - http://www.egr.uri.edu/che/course/che333/Structure.pdf [Broken]
     
    Last edited by a moderator: May 4, 2017
  4. Feb 7, 2010 #3

    kelvin490

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    Does it mean a close packing plane is a plane that the atoms cannot be packed any closer?

    Thanks for reply.
     
    Last edited by a moderator: May 4, 2017
  5. Feb 7, 2010 #4

    Astronuc

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    No - it just means that it is the plane with the closest separation of the atoms.

    http://www.jwave.vt.edu/crcd/farkas/lectures/structure.ppt [Broken]

    Under normal conditions, the atoms aren't packed closer. Only under increasingly high pressures would they get closer.
     
    Last edited by a moderator: May 4, 2017
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