Carbon effect on retention and release of deuterium implanted in Mo

Retention and release behavior of deuterium in carbon deposited Mo single c rystals were studied during and after 10 keV D-2(+) implantation. Concentra tion profile of implanted D atoms and chemical composition in the near surf ace layer of Mo were measured by ion beam analysis techniques. The amount o f retained deuterium in Mo at room temperature increased with carbon conten t in the surface layer of Mo. For the layer containing high concentration o f carbon as 0.5 C/Mo, the saturation concentration of the implanted deuteri um was found to be about 0.3 D/host atoms, and the total amount of deuteriu m in the surface layer reached 2 x 10(21) D/m(2) which was 20 times larger than that in a clean surface of Mo. In comparison with the clean surface of Mo, thermal release of deuterium from the carbon contained Mo surface occu rred mainly at lower temperature, and no significant release was observed a bove 450 K. (C) 1998 Elsevier Science B.V. All rights reserved.