Samples were prepared by arc-melting in an Ar ambient which contained 10%D. Desorption of D from the alloys, which contained between 0.009 and 0.092at%C or between 0.006 and 0.092at%B, was studied by using a vacuum desorption method at temperatures ranging from 533 to 953K. It was found that the diffusivity could be described by:

D (m2/s) = 1.65 x 10-5 exp[-60(kJ/mol)/RT]

The addition of C or B decreased the diffusivity. This decrease was attributed to the trapping effects of carbides or borides, and the trap energy was deduced to be 54kJ/mol for both Mo-C and Mo-B alloys.

Effect of Carbon and Boron Additions on Deuterium Diffusion in Molybdenum. T.Noda, M.Okada: Transactions of the Japan Institute of Metals, 1987, 28[6], 517-23