The H solubility and diffusion were studied in Ti0.1Zr0.9(Mn0.9V0.1)1.1Fe0.5Ni0.5, Ti0.1Zr0.9Mn0.9V0.1Fe0.55Ni0.55 and (Ti0.1Zr0.9)1.1Mn0.9V0.1Fe0.5Co0.5 at 450 to 650C, using H-gas pressures of up to 100mbar and H concentrations of up to 0.03 H-atoms per formula unit. The H2 absorption was exothermic, and the values of the partial enthalpy of solution per H atom ranged from -0.370 to -0.466eV. Silica-embedded AB2 alloy particles were prepared by using sol-gel techniques. The P–C isotherms of encapsulated AB2 alloy particles were obtained at 0 to 30bar and 30 to 100C. The diffusion of H interstitials in sol-gel encapsulated Ti0.1Zr0.9Mn0.9V0.1Fe0.5Ni0.5, (Ti0.1Zr0.9)1.1Mn0.9V0.1Fe0.5Ni0.5 and (Ti0.1Zr0.9)1.1Mn0.9V0.1Fe0.5Co0.5 particles were studied between 500 and 650C  (tables 17 and 18), with H2 gas pressures of up to 100mbar and H concentration of up to 0.014 H atoms per formula unit. The diffusion coefficient of H interstitials was determined from the kinetics of H absorption. The activation energies were calculated from the temperature-dependence of the diffusion coefficient, and the values ranged from 0.416 to 0.897eV.

Hydrogen Solubility and Diffusion Studies of Zr-Based AB2 Alloys and Sol-Gel Encapsulated AB2 Alloy Particles. M.Kandavel, S.Ramaprabhu: Intermetallics, 2007, 15[7], 968-75

Table 18

Arrhenius Parameters for H in Zr-Alloys

*sol-gel encapsulated