Ion-driven permeation and surface recombination coefficient of deuterium for ion

• Published in: Journal of nuclear materials Vol. 202; no. 3; pp. 228 - 238
• Main Authors: Nagasaki, Takanori, Saidoh, Masahiro, Yamada, Reiji, Ohno, Hideo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.1993
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/0022-3115(93)90392-C

The steady-state flux of deuterium permeation through an iron membrane (99.99 + % purity, 0.14 mm thickness) driven by a deuterium ion beam (5 keV D 3 +, 1.0 × 10 15 D-atoms cm −2 s −1) was measured in the range of 30–1050°C. The permeation flux increased with increasing temperature above 200°C whereas it was roughly constant below 150°C. Such temperature dependence was observed for nickel and copper as well, and has been ascribed to the transition in the rate-limiting processes of the deuterium transport in the membrane. The recombination coefficient of deuterium on iron surface was evaluated from the permeation flux density. In the case of α-iron, the evaluated value agreed with a semitheoretical one estimated using literature data of adsorption probability and solubility. This agreement indicates that the release kinetics reflects the activation barrier for hydrogen (deuterium) adsorption.