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The metal hydride Ti2Cu0.8Ni0.2H0.65, studied by X-ray diffraction and EXAFS speetroscopy, was found to have the same phase as Ti2Cu,both belonging to the tetragonal system and the I 4/mmm space group. The nearest-neighbour distance of Cu-Ti was found to be considerably shorter than, while the those of Cu-Cu and Cu-Ni almost equal to,the corresponding values in unhydrided alloy Ti2Cu0.8Ni0.2.These results suggest that the hydrogen atom occupies the tetrahedral interstitial site defined by four Ti atoms in a unit cell of Ti2Cu0.8Ni0.2H0.65.The H-Ti nearest-neighbour distance of 1. 86A is much shorter than the sum of the atomic radii of H and Ti, indicating a strong H-Ti bond . This may be an important reason for the high thermal stability of the title hydride.
The metal hydride Ti2Cu0.8Ni0.2H0.65, studied by X-ray diffraction and EXAFS speetroscopy, was found to have the same phase as Ti2Cu, both belonging to the tetragonal system and the I4 / mmm space group. The nearest-neighbor distance of Cu-Ti was found to be relatively shorter than, while those of Cu-Cu and Cu-Ni almost equal to, the corresponding values in unhydrided alloy Ti2Cu0.8Ni0.2. These results suggest that the hydrogen atom occupies the tetrahedral interstitial site defined by four Ti atoms in a unit cell of Ti2Cu0.8Ni0.2H0.65.The H-Ti nearest-neighbor distance of 1. 86A is much shorter than the sum of the atomic radii of H and Ti, indicating a strong H-Ti bond. This may be an important reason for the high thermal stability of the title hydride.