Compute diffusion coefficients for the interdiffusion of carbon in both $($a$)$ a$-$iron $($BCC$)$ and $($b$)-$iron $($FCC$)$ at $1000C.$ Assume

that $D_0$ for the interdiffusion of carbon in $-$iron and in $y-$iron are $1\mathrm{.}1{10}^{-6}$ and $2\mathrm{.}3{10}^{-5}\frac{m^2}{s},$ respectively, and that $Q_d$ are $80$

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

$($a$)$

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

$($b$)$

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