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The hydrogenation of Zr3-xTixV3-yNiyOo.6 (0≤x,y≤1.5) alloys has been studied. Phase-structural characteristics of the as cast alloys and their hydrides have been determined by X-ray powder diffraction. In most of alloys the main phase constituent was found to be oxygen-stabilised η-phase (Zr,Ti)3(V,Ni)3O0.6 with the filled-Ti2Ni structure type. The influence of oxygen on phase composition and hydrogenation properties in the case of partial substitution of Zr and V by Ti and Ni has been discussed.

Zirconium-based Zr-V and Zr-Fe alloys are known to be highly efficient absorbers of low pressure hydrogen. Their working performance is structure-dependent and can be improved by modifying the composition of the basic alloys with doping elements. Particularly promising in this respect are modifications of oxide materials where both H-sorption capacity and hydrogenation activity can be increased substantially, especially when boron or rare earth oxides are introduced into the matrices of Zr-V and Zr-V-Fe[1–3].