The diffusion of hydrogen atoms in Pd was represented as a chain of successive thermally activated events of octapore → tetrapore, tetrapore → octapore, etc. transitions with two different activation energies which determined the residence time of hydrogen atoms in tetra- and octapores and atomic concentrations in these positions. Equilibrium concentrations and coefficients of hydrogen diffusion at 500 to 900K were determined, and the activation parameters of the octapore → tetrapore and tetrapore → octapore transitions were calculated.

Molecular-Dynamics Simulation of Hydrogen Diffusion in Pd. Evteev, A.V., Ievlev, V.M., Kosilov, A.T., Prizhimov, A.S.: Physics of Metals and Metallography, 2005, 100[2], 179-81