Question

Zinc crystallizes in HCP structure given its crystal parameters a = 2.66A, C = 1 and its atomic weight = 65.37, calculate the density of Zinc

Answer 1

The packing fraction for zinc is 0.62. In the hexagonal close packed system (HCP) there are 2 atoms per cell. Hence, the density is

$$\rho=\frac{M}{V}=\\ \space\\ =\frac{2\cdot0.62\cdot65.37\cdot1.66054\cdot10^{-27}}{(2.66\cdot10^{-10})^3}=7152\text{ kg/m}^3.$$