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5. A 8CC inon structure is to be manufactured that will allow no more than 50g of hydrogen to be lost per year through each
5. A 8CC inon structure is to be manufactured that will allow no more than 50g of hydrogen to be lost per year through each square centimeter of the iron at 400C. If the concentration of hydrogen at one surface is 0.05H atoms per unit cell and the concentration at the second surface is 0.001H atoms per unit cell, determine the minimum thickness of the iron. For the diffusion of hydrogen in BCC iron, D0=0.0012cm2/s and Qj=1.5062107J/mol. Atomic weight of H : A=1.01g/mol, and atomic radius of BCC: R=0.124nm. (Hint: Compute the diffusion flux in terms of the number of atoms, also compute the concentration gradient in terms of the number of atoms (considering the number of atoms in a BCC unit cell and the volume of the unit cell), and finally use Fick's first law to get the minimum thickness.)
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