The ion- and atom-driven transport of deuterium in No under the influence of surface impurities

摘要

Atom- as well as ion-driven permeation behavior of deuterium in Nb was studied experimentally. The measurements were performed under two different vacuum conditions which resulted in contrasting surface compositions: one resulted in a surface rich in carbon (C) after atom beam irradiation and the other rich in sulfur (S) which was unaffected by the irradiation. The result of permeation measurements revealed that when the specimen surface was covered by sulfur the deuterium permeation rate weakly depended on the temperature, whereas when the surface was rich in carbon and oxygen it tended to decrease sharply for temperatures below approx 700 K.