In an interdiffusion experiment between an A-B alloy and pure A metal the component diffusion coefficients of A and B at a given composition xB is given by DA = 108 cm2/s and DB = 0.8DA. The concentration gradient across a lattice plane where the concentration of A corresponds to xA was found to be 0.1 mol/cm4. Assume that the alloy is ideal, vacancies are the predominant defects and that a continuous solid solution between A and B exists with a fcc crystal structure (lattice parameter 3.0 ). a) What is the vacancy flux across this lattice plane? b) What is the drift velocity of the lattice plane considered before relative to the immobile end of the sample?