An exact algebraic expression was derived for the diffusivity for diffusion between interstitial e and g sites in the cubic C15 Laves phase AB2 in terms of four rates of jumping between the interstitial sites. The result was for the low concentration limit of diffusing atoms and was valid for arbitrary positions of the e and g sites. The expression reduces to simple forms in some special cases. Some examples of diffusion of H in C15 intermetallic compounds were discussed.

Diffusivity for Diffusion between e and g Interstitial Sites in the C15 AB2 Structure. C.A.Sholl: Journal of Physics - Condensed Matter, 2005, 17[8], 1329-34