Pradeep Jogsan posted an Question
October 28, 2021 • 18:12 pm 30 points
  • IIT JAM
  • Physics (PH)

Q53. kci has the nacl type structure which is fcc with two-atom basis, one at (0,0,0) and the other at (1/2,1/2,1/2). assume that the atomic form factors of k"

Q53. KCI has the NaCl type structure which is fcc with two-atom basis, one at (0,0,0) and the other at (1/2,1/2,1/2). Assume that the atomic form factors of K" and Cl are identical. In an X - ray diffraction experiment on KCI, which of the following (hkl) peaks will be observed? (a) (100) (b) (110) (c) (111) (d) (200)

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    Bidyut sinha

    please see attached picture.Actually , in cases of FCC structure, allowed reflections are either all odd or all even..Now here k+ and cl- are identical.So for Kcl having two identical scale factor follows reflection =2× (simple cubic reflection)= 2×{(1,0,0) ,(1,1,1)...}=(2,0,0),(2,2,2).... so here option (d)(2,0,0) is correct.

    cropped722187249.jpg
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