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Help with reciprocal lattices

  1. Nov 8, 2014 #1
    1. The problem statement, all variables and given/known data
    I have to draw a reciprocal lattice of a tetragonal cell with parameters a=3A and c=5A, a body-centred lattice. How do I find a* and c*? I also have to draw an Ewald sphere, and lamda=1.5. However, if I use my solutions (I think they're wrong, see below) I get something that is impossible to draw because the scale is huge.

    2. Relevant equations
    Radius of E sphere= 1/lamda

    3. The attempt at a solution
    a*=1/9 and c*= 1/25, the radius= 2/3
     
  2. jcsd
  3. Nov 8, 2014 #2

    haruspex

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    Not an area I know anything about, but from a little reading it seems the reciprocal lattice will be a face-centred tetragonal lattice, yes?
    The parameters are obtained by dividing vector cross products by the scalar triple product.
    Please post your working for your attempted solution. (I get a different answer.)
     
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