Low- and high-temperature x-ray diffraction investigations of titanium dihydride (TiH/sub 1.99/) and dideuteride (TiD/sub 1.98/) have indicated apparent 'second-order transformations' in both substances below a critical temperature of 310 deg K. The tetragonal low-temperature phases are distortions of the cubic fluorite high-temperature phases, and are isomorphous with the tetragonal ZrH/sub 2/ structure. A similar study of zirconium dihydride (ZrH/sub 1.92/) has shown that the tetragonality of the lattice of this substance is also temperature- dependent. The critical temperature of the second-order transformation' in ZrH/ sub 1.92/ is unattainable in the present diffraction apparatus owing to dissociation of the hydride. Possible causes of the transformations are discussed. (auth)
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