IGNOU PHE 13 2018 - Determine the conditions governing geometrical structure factor for an

Question

Determine the conditions governing geometrical structure factor for an fcc lattice.
Is reflection observed from the (111) and (211) planes of the fcc structur

27 Jan 2018

Answer :

Word Count : 511

To determine the conditions governing the geometrical structure factor for an FCC (face-centered cubic) lattice, we need to understand the diffraction condition in the context of the reciprocal lattice and the structure factor. Let's break it down step by step. ### 1. Structure Factor for FCC Lattice The structure factor \( S(hkl) \) for a crystalline lattice is given by the sum of the contributions from all the atoms in the unit cell, considering their positions and the form factors. For an FCC lattice, the general form of the structure factor is: \[ S(hkl) = \sum_j f_j \exp \left( 2 \pi i \left( h x_j + k y_j + l z_j \right) \right) \] where: - \( f_j \) is the atomic form factor of atom \( j \), - \( (x_j, y_j, z_j) \) are the coordinates of atom \( j \) within the unit cell, - \( (h, k, l) \) are the Miller indices of the plane being considered. For an FCC lattice, the atoms are located at the following fractional

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