Abstract
The site occupancy of hydrogen in Ta alloyed with undersized Nb atoms (atomic radius rTa = 1.44 A and rNb = 1.43 A) up to 3 at. %, Ta0.97Nb0.03H0.0173 and Ta0.97Nb0.03H0.0495, has been investigated at room temperature by the nuclear reaction channelling method. The following results were obtained. H atoms occupy tetrahedral (T) sites and d-T sites, which are displaced by 0.25–0.30 A from T sites towards their nearest neighbour octahedral (O) sites. However, the concentration of available T sites, CT, is limited. Hydrogen preferentially occupies T sites in the undistorted or very weakly distorted tetrahedra some distance away from Nb solutes and excess H atoms enter d-T sites in the tetrahedra distorted at an intermediate level near Nb solutes. Therefore, Nb–H interaction is not attractive in Ta, in contrast to the attractive interaction between an undersized Mo atom and hydrogen in Nb. These results are very similar to those previously obtained for hydrogen in Nb alloyed with similar concentration of over...
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