PHASE-STRUCTURE OF V-BASED SOLID-SOLUTIONS CONTAINING TI AND NI AND THEIR HYDROGEN ABSORPTION-DESORPTION PROPERTIES

Crystal structures and pressure-composition isotherms were investigate d for the vanadium rich ternary Ti-V-Ni solid solution. The alloy cont aining more than 85at.% vanadium absorbed hydrogen of 1.6 in H/M ratio that amounted to 3.2 mass% H. The pressure-composition isotherm for T i22V66Ni12 in the hydrogen pressure range of 10(0) to 10(-8) MPa was o btained by the electrochemical method. Two pressure plateaus were foun d at hydrogen pressures of 10(-2) MPa and 10(-6) MPa. The upper platea u would be ascribed to the reaction from dihydride to monohydride and the lower plateau would be ascribed to the reaction from monohydride t o solid solution of the alloy and hydrogen.