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At the surface of a steel bar there is one carbon atom per 40 unit cells of iron. At 2 mm below the surface,

 

At the surface of a steel bar there is one carbon atom per 40 unit cells of iron. At 2 mm below the surface, there is one carbon atom per 50 unit cells. The structure at 1000 C is FCC with the lattice parameter a = 0.365 nm. Calculate the concentration gradient.

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