(Solved): Question for Mechanical Engineering (6) The metal niobium (Nb) has a BCC crystal structure. If the ...

Question for Mechanical Engineering

(6) The metal niobium (Nb) has a BCC crystal structure. If the angle of diffraction for the (211) set of planes occurs at 75.99° (first-order reflection) when monochromatic x-radiation having a wavelength of 0.1659 nm is used, compute the the interplanar spacing for this set of planes and the atomic radius for the Nb atom. Bragg's Law is n?=2dsin(0), and the interplanar spacing formula for cubic crystal class is dhk={a[h²+k²+1²]-1/2}. (7) What is density of a given engineering materials of utmost importance in engineering? Discuss concisely. (8) What is a single crystal and what is a polycrystalline material? Compare and contrast them concisely. (9) Explain how elastic strain is measured using x-ray diffractions. (10) List the Miller indices of the atomic planes belonging to the {111} family.