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Structure Factor BCC

  Structure Factor: Other structures     1 of 1
 
If we consider an extended reciprocal lattice, then we see that bcc lattice structure becomes an fcc lattice in reciprocal space. (In reciprocal space all indices must be integers.)

Other structures

Structure factors for other non-primitive structures can be derived similarly. Some important results are:

• forbidden reflections for the fcc structure occur when h, k and l are not all even or not all odd (e.g. 211 is forbidden). This time the reciprocal lattice of allowed reflections is bcc with all the indices integer; and

• forbidden reflections for the hcp structure occur when h+2k = 3n and l is odd, where n is an integer (e.g. 113 is forbidden).

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FCC image
 

 
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