Calculate the flux (J) Between points x and y

[alevis]

The diffusion of Ni in FCC Fe. There is 0.3 atoms % of Ni in a solid solution in FCC Fe @ point x.
Point y is 1 mm away and has 0.2 atoms % of Ni within the solid solution.
Temperature = 1000° C, D = 2ε^-16M²/s

Calculate the flux (J) between points x & y.
Radius of Fe atom = 0.13 nm @ 1000°C; a = 0.37nm.

ATTEMPT AT A SOLUTION
Ni is FCC
4 atoms in unit cell of FCC. a= 4T/(√3)
# Atoms = 8*10²⁸

J = -D(dc/dx)
Δc = 1.6e26-2.4e26
Δx = 1mm = 1*10^-6 nm
J = -1.6e25 is this right?

 

[nbryan5]

The correct answer is not provided, as this problem requires additional information in order to be solved. The equation for the flux (J) is J = -D(dc/dx). The equation still needs to be filled in with information such as the diffusion coefficient (D) and the change in concentration (Δc). With that information, the flux can be calculated.