Lattice Location Study on H in Ta by the Channeling Method

抄録

By the channeling method using the nuclear reaction ¹H(¹¹B, α)αα, the lattice location of H in TaH_0.07(α-phase) was determined at room temperature, and the effect of strain on the hydrogen location was investigated by introducing internal strains by thermal cycling that gives rise to precipitation and redissolution of the β-phase. It is concluded that hydrogen atoms are located at tetrahedral sites in the α-phase of a Ta–H system, and the location does not change by such thermal cycling. Compared with the previous results on H in V and Nb, the present result indicates that the hydrogen location in Ta is less sensitive to the strain than in V as in the case of Nb.