engineering

Niobium (Nb) has the BCC crystal with a lattice parameter a = 0.3294 nm. Find the planar

concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has

the most concentration of atoms per unit area? Sometimes the number of atoms per unit area nsurface on the

surface of a crystal is estimated by using the relation nsurface = nbulk

2/3 where nbulk is the concentration of

atoms in the bulk. Compare nsurface values with the planar concentrations calculated above and comment

on the difference. [Note: The BCC (111) plane does not cut through the center atom and the (111) has

1/6th of an atom at each corner