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Debanjana Adhikari posted an Question
May 19, 2020 • 16:15 pm 30 points
  • CSIR NET
  • Physical Sciences

Consider x-ray diffraction from a crystal with a face-centered-cubic (fec) lattice. the lattice plane for which there is no diffraction peak is (a) (2, 1,2) (b)

Consider X-ray diffraction from a crystal with a face-centered-cubic (fec) lattice. The lattice plane for which there is NO diffraction peak is (a) (2, 1,2) (b)(1, 1, 1) (c)2,0,0) (d) 3, 1, 1)

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  • comment-profile-img>
    Dhairya sharma

    ans is a see attached. for all hkl should be even or odd.

    cropped8024586927685920903.jpg
  • comment-profile-img>
    Abhishek singh best-answer

    The plane will be present if all Miller Indices are odd or all the Miller Indices are even. But if you have a mixture of odd and even,then the plane will be absent. So option A is correct.

    cropped2424600344781334631.jpg
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    ask doubts if any

  • comment-profile-img>
    Ruby negi

    option b contains odd , option c contain only even and same option d contains odd.. so option a is correct for this mixed odd even , fcc shows no peak..

  • comment-profile-img>
    Ruby negi

    option a is correct as fcc show peaks for either odd or even.. not for mixed even odd plane .

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