Question

Problem 1 1. For a bcc unit cell with an atomic density of 1.6 x 10 22 cm-3, calculate the lattice constant. 2. Out of (100), (110) and (111) planes in a bcc unit cell, which plane has the highest atomic density and which plane has the lowest atomic density? 3. Repeat 1-2 for an fcc unit cell with the same atomic density. 4. Compare planar atomic densities and lattice constants for bcc and fcc unit cells in a table and make your comments. 5. In two crystal planes in a unit cell, one of the planes has a higher atomic density as compared to the other. Which plane do you think is more favorable for current conduction and why? Problem 2 (a) Determine the Miller indices for the plane identified by the shaded region. (b) Determine the crystallographic direction for the plane as shown by the shaded region.

          Problem 1

1. For a bcc unit cell with an atomic density of 1.6 x 10 22 cm-3, calculate the
lattice constant.
2. Out of (100), (110) and (111) planes in a bcc unit cell, which plane has the
highest atomic density and which plane has the lowest atomic density?
3. Repeat 1-2 for an fcc unit cell with the same atomic density.
4. Compare planar atomic densities and lattice constants for bcc and fcc unit
cells in a table and make your comments.
5. In two crystal planes in a unit cell, one of the planes has a higher atomic
density as compared to the other. Which plane do you think is more favorable
for current conduction and why?

Problem 2

(a) Determine the Miller indices for the plane identified by the shaded region.

(b) Determine the crystallographic direction for the plane as shown by the shaded
region.

Problem 1

1. For a bcc unit cell with an atomic density of 1.6 x 10 22 cm-3, calculate the
lattice constant.
2. Out of (100), (110) and (111) planes in a bcc unit cell, which plane has the
highest atomic density and which plane has the lowest atomic density?
3. Repeat 1-2 for an fcc unit cell with the same atomic density.
4. Compare planar atomic densities and lattice constants for bcc and fcc unit
cells in a table and make your comments.
5. In two crystal planes in a unit cell, one of the planes has a higher atomic
density as compared to the other. Which plane do you think is more favorable
for current conduction and why?

Problem 2

(a) Determine the Miller indices for the plane identified by the shaded region.

(b) Determine the crystallographic direction for the plane as shown by the shaded
region.

Added by Celia G.

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