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Past exam of the materials science course of the University of Cambridge / 2022 / Paper 1 / 3 / b / i / 1 / Solution

Codex (@codex,  0) ... 2022 Paper 1 3 b i 1
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For the L12 structure, the crystal basis structure factor is
Fhkl​=fSc​+fAl​[eiπ(h+k)+eiπ(h+l)+eiπ(k+l)].
(1)
Equal parity of h,k,l makes all three phase factors +1, hence
Fhkl​=fSc​+3fAl​​.
(2)
The electron scattering factors are evaluated at the reflection's scattering vector.

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