Abstract
Be 2Zr was found to react readily with hydrogen at room temperature and atmospheric pressure to form Be 2ZrH 1.5. Neutron investigations of Be 2ZrD 1.5 showed that the compound crystallized in the space group P6/ mmm with the zirconium atom at 0,0,0 and the two beryllium atoms at 1/3,2/3,1/2 and 2/3,1/3,1/2. The deuterium atoms enter the positions 1/3,2/3,0 and 2/3,1/3,0. The unit cell parameters are a = 0.371 39 ± 0.000 06 nm and c = 0.347 04 ± 0.000 08 nm. Deuterium is surrounded by two beryllium atoms at a distance of 0.1735 nm and three zirconium atoms at 0.2144 nm. Inelastic neutron scattering measurements on Be 2ZrH 1.47 gave a broad optical peak apparently consisting of two peaks at 84 and 100 meV. The high energy optical peak for Be 2ZrD 1.49 was observed at 70 meV.
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