(b) An interstitial solute diffuses through a 0.25 mm thin foil of nickel at a steady rate, when one of the surfaces is maintained at a constant concentration given by the equilibrium solubility. Use the following data to derive the diffusion coefficients at temperatures of 1250 K and 1140 K respectively: Temperature (K) | Solubility (kmol/m3) | Flux (kmol/m2s) 1250 | 3.12 | 5.63 x 10?? 1140 | 5.89 | 8.01 x 10??
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We need to use Fick's first law of diffusion, which states that the flux (J) of a solute through a material is proportional to the concentration gradient (dc/dx) and the diffusion coefficient (D): J = -D(dc/dx). Show more…
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