Abstract
The site occupancy of hydrogen in 52 at. % Nb–48 at. % Mo alloys is investigated at room temperature for hydrogen concentrations 0.028 and 0.055 in the hydrogen–metal-atom ratio ( C H =[H]/[M]) by the channelling method utilizing a nuclear reaction 1 H( 11 B,α)αα with a 11 B beam. A large portion of H atoms are located at sites displaced from tetrahedral ( T ) sites towards their nearest neighbour octahedral ( O ) sites by about 0.3 A (displaced- T sites; d - T ), which are similar to the sites observed in V under uniaxial stress and completely different from the sites observed in the Nb alloys containing undersized Mo atoms up to 26 at. %. For C H =0.028 and 0.055, 30–40% and 15–25% of H atoms are located at T sites, respectively.
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