THERMOCRYSTALLOGRAPHY OF THE HYDRIDES OF TITANIUM, ZIRCONIUM AND HAFNIUM
A high-temperature x-ray-diffraction study of the dihydrides of zirconium and hafnium has indicated that an apparent second order transformation occurs in the hydrides below critical temperatures of approximately 900 and 407 deg C, respectively. The low-temperature tetragonal phases are distortions of the high-temperature cubic fluorite phases, and are isomorphous with the tetragonal TiH/sub 2/ structure. The tetragonality of the dihydrides is temperature dependent. The variation of the lattice constant of the cubic fluorite lattice of titanium and hafnium hydrides at constant temperature was found to be dependent upon composition of the hydride and hydrogen gas pressure over the specimen in a complex manner. The absorption of hydrogen by the group IVA transition metals to form hydrides and the accompanying crystal structure changes are discussed. (auth)
- Research Organization:
- Tufts Univ., Medford, Mass.
- NSA Number:
- NSA-14-014768
- OSTI ID:
- 4158663
- Report Number(s):
- TID-5913
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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