Question

2. Compute the following: a. Find the spacing between the (111) planes in the following lattices Simple Cubic, Body Centered Cubic, and Face Centered Cubic b. Repeat part a. for the (220) and the (222) planes. c. Does third order X-ray diffraction occur from the (111) planes in the simple cubic lattice (lattice constant 5.196 Angstroms) at an angle of 30 degrees for an X-ray wavelength of 1 Angstrom. d. Does your answer to part c. remain the same if the lattice was the BCC lattice instead of the simple cubic? If not why not (show calculations)? 3. Compute the atomic (atoms/cm) and mass density (grams/cm) for silicon given that silicon's gram molecular weight is 28.1 grams. 4. Compute the packing fraction for the diamond lattice. Compare it to the packing fractions for the simple cubic, body centered cubic, and the face centered cubic.

Answer 1

ve haire planes Foo ou (C) plane (111) j.e le),k-t,kl we have

e (o.o1 -to nm Ca 3 се Jo Same. 0.23312 と0.23 312. ー

for dicanona/すNahms-b aumon F = 0.3401-34 Cc