Diffusion Coefficient of C in $α$ -Iron

An equation of the form

D = D_{0} e^{- \frac{Δ H}{RT}}

is developed for interstitial diffusion in cubic lattices. This development uses a classical statistical mechanical treatment. Measurements of

D

for

C

α

-iron were made from -35° to 200°C. Combined with earlier data they extend the knowledge of

D

in this system from

D = 10^{- 20}

D = 10^{- 6}

{cm}^{2}

/sec. The values of

D_{0}

and

Δ H

obtained by fitting the above equation to the experimental points give

D_{0} = 0.02

{cm}^{2}

/sec. and

Δ H = 20, 100

cal./mole.

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Diffusion Coefficient of C inα-Iron