Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Aluminum Crystal Structure

  1. Oct 9, 2003 #1
    For my project, I am creating a pure aluminum model with styro foam balls and toothpicks. I know this structure is a "face-centered cubic". However, I don't know the bonding angles and what kind of bonding shape (tetrahedral, octahedral ...), I need the information for the write-up. Can someone help please.
     
  2. jcsd
  3. Oct 9, 2003 #2

    FZ+

    User Avatar

    Er... being a metal, I wouldn't think pure aluminium would really form any distinct bonds that you can represent. Most models of metal crystals are simply layers of balls glued onto each other.

    To visualise a face centred cubic structure, picture a cube with eight aluminium particles, one on each vertex. At the centre of each face, there is an additional particle. Repeat pattern many times, et viola.

    eg.

    Code (Text):

    Layer 1:

    O   O   O
      O   O
    O   O   O
      O   O
    O   O   O

    Layer  2:

      O   O
    O   O   O
      O   O
    O   O   O
      O   O

    Layer 3:


    O   O   O
      O   O
    O   O   O
      O   O
    O   O   O


     
    Don't trust my crappy diagram so much though.
     
    Last edited: Oct 9, 2003
  4. Oct 9, 2003 #3
    Thanks for the reply. Now I understand.
     
  5. Nov 6, 2008 #4
    I think the third layer is wrong.
     
  6. Nov 23, 2008 #5
    The third layer is identical to the first layer. And the fourth would be identical to the second and so on. It is basically the way in which the atoms stack together the best. If all the layers were identical there would be too much empty space between atoms.
     
  7. Nov 23, 2008 #6
    But In aluminium, there is FCC lattice. That means, the third layer must be different also. It has ABCABC-----pattern and not ABAB_____ pattern
     
  8. Nov 24, 2008 #7

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    This is correct if one is drawing the close-packed {111} planes. But FZ+ drew the {100} planes correctly; every other {100} plane is identical.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Aluminum Crystal Structure
  1. Aluminum Properties? (Replies: 3)

  2. Dissolving Aluminum (Replies: 13)

Loading...