Question

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We have a crystal structure of an ordered magnetic Fe-Pt alloy. There are 10 Pt atoms and 4 Fe atoms. The length of each edge is l=0.39 nm. For X-ray diffraction analysis the wavelength is λ=0.154 nm.

a. What is the lattice constants of this crystal structure?

b. Will you be able to observe (001) diffraction peak of this ordered Fe-Pt alloy in X-ray diffraction? If so, calculate the corresponding diffraction peak position, 2θ (θ is the diffraction angle). If you cannot see a diffraction peak, explain why.