Abstract
Pressure-composition isotherms were measured for the Ti 0.2V 0.8−H 2 and Ti 0.4V 0.6−H 2 systems at temperatures between 80 and 150°C and pressures below 100 kgf cm −2 the hydride phases formed were identified by X-ray diffraction. In the Ti 0.2V 0.8−H 2 system, a plateau region was observed between a body-centred tetragonal phase Ti 0.2V 0.8H ≈0.8 and an f.c.c. phase Ti 0.2V 0.8H ≈1.6. These hydride phases correspond to the monohydride and the dihydride of the V−H 2 system. In the Ti 0.4V 0.6−H 2 system, the transformation between the two hydride phases was found to be irreversible and the higher hydride did not decompose under the experimental conditions used.
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