Compute diffusion coefficients for the interdiffusion of carbon in both $($a$)-$iron $($BCC$)$ and $($b$){}^{-}$

iron $($FCC$)$ at $950C.$ Assume that $D_0$ for the interdiffusion of carbon in $-$iron and in $-$iron are

$1\mathrm{.}1{10}^{-6}\frac{m^2}{s}$ and $2\mathrm{.}3{10}^{-5}\frac{m^2}{s},$ respectively, and that $Q_d$ are $80k\frac{J}{m}ol$ and

$148k\frac{J}{m}ol,$ respectively.

$($a$)$

$10$

$\frac{m^2}{s}$

$($b$)$

$10$

$\frac{m^2}{s}$