At room temperature the Fe and V both have BCC structures. The lattice parameter of a Fe-V solid solution depends on the amount of V added. The average atomic radius of an Fe-V solid solution can be measured by adding the atomic radii of V and Fe, weighted by their respective atom fractions. The lattice parameter can thus be computed from the average atomic radius.
Calculate the V concentration in the weight percent (wt %) required to form an Fe-V alloy with a lattice parameter of 0.2875 nm.