First principle calculations were used to study the hydrogen migration properties in bulk body-centered cubic tungsten. Hydrogen has low solubility in tungsten and occupies the tetrahedral interstitial site with an energy difference of 0.38 eV compared to the octahedral interstitial site. The hydrogen diffusion coefficient was evaluated using the harmonic transition state theory and was found to agree with the experimental results at temperatures above 1500K. The height of the migration barrier between two adjacent tetrahedral sites was found to be 0.21 eV, which was lower than the value 0.39 eV obtained for the migration barrier from degassing measurements in the temperature range between 1100 and 2400K. The tunnelling correction to the diffusion rate provides much better agreement with the experimental result at 29K than the extrapolated experimental D from high temperature measurements.

Diffusion of Hydrogen in BCC Tungsten Studied with First Principle Calculations. K.Heinola, T.Ahlgren: Journal of Applied Physics, 2010, 107[11], 113531