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Homework Help: X ray diffraction For crystal structure Analysis

  1. Sep 10, 2007 #1
    1. Find the crystal structure , the lattice parameter of the metal.
    Known 2[tex]\theta[/tex] of the peaks
    17
    21
    28
    33
    35
    41
    45
    46




    2. bragg's law [tex]\lambda[/tex]=2 d[tex]_{h,k,l}[/tex] /b]sin[tex]^{2}[/tex]([tex]\theta[/tex])
    Also, the cubic interplanes distance d[tex]_{h,k,l}[/tex] = a0/(squr(h[tex]^{2}[/tex]+k[tex]^{2}[/tex]+l[tex]^{2}[/tex])



    3. The attempt at a solution:
    Since I didn't know the lattice parameter I just take the sin[tex]^{2}[/tex] of every theta and the divide every number between the smallest number, (the first peak one), to get integers. According to that I should know which cubic structure is( BCC FCC SC) What's happens is that I get the following numbers with all the procedure 4,6,12,14,16,22,26,28. I can't identify which one is.


    Thanks for any help.
     
    Last edited: Sep 10, 2007
  2. jcsd
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