3663. ---------------. [WERT, C. A.] Diffusion Coefficient of Carbon in Alpha-Iron. Phys. Rev., vol. 79, 1950, pp. 601-605; Chem. Abs., vol. 44, 1950, p. 9760.
Equation of the form ^{∆H/RT
}is developed for interstitial diffusion in cubic lattices.
This development uses a classical statistical mechanical treatment.
Measurements of D for C in a-Fe
were made, -35° to 200°. Combined
with earlier data they extend the knowledge of D
in this system from D=10^{-20}
to D=10^{-6} cm.^{2}
per sec. The values of D and _{o}∆H
obtained by fitting this equation to the experimental points give D0.02
cm._{o}=^{2} per sec. and ∆H=20,100
cal. per mol. |