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Homework Help: Planar Density of (0,-1,1,0) plane in HCP

  1. Mar 26, 2015 #1
    How can I calculate the planar density of the (0,-1,1,0) plane in HCP? (in terms of atomic radius r)
     
  2. jcsd
  3. Mar 29, 2015 #2

    Astronuc

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    What is the definition of planar density?

    Knowing the c and a lattice parameters, how would one calculated the area of the (0,-1,1,0) plane?

    How do the c and a lattice parameters relate to the atomic radius?
     
  4. Mar 30, 2015 #3
    Finding "a" is easy it's equal 2r but finding "c" is more complicated, also determine how many atoms that plane crosses is complicated as well.
     
  5. Mar 30, 2015 #4

    Astronuc

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    One should be able to find c as a function of r by looking at the packing of the 3 interior atoms between the top and bottom planes of the hexagonal cell.

    Ostensibly, there is a theoretical c/a.
     
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