1. MoB is I4₁/amd with a = 3.110, c = 16.95 Å, and Mo and B atoms in 8e, z = 0.196 and 0.352, respectively. Use a spreadsheet program to calculate F for the first 10 reflections that can be observed in a powder pattern, using CuK alpha radiation, from a well-prepared specimen.

You will need to consult the International Tables for X-ray Crystallography (EMS & Science Libraries, the web, or my office) for the several different types of information needed for these calculations.

Also, for tetragonal:

1/d² = (h² + k²)/a² + l²/c²

Since there are 16 atoms in the unit cell, nominally, there will 16 terms in your summation. However, one can cut this to 4 by cleverly noting that the structure is centrosymmetric (cuts number of terms in half) and also I-centered (cuts number of terms in half). If you use this shortcut, you will need to determine and show mathematically how it works.

Please submit your answers by email as an .xls file.