Author/Authors :
Suwarno، نويسنده , , S. and Solberg، نويسنده , , J.K. and Mوhlen، نويسنده , , J.P. and Denys، نويسنده , , R.V. and Krogh، نويسنده , , B. and Ochoa-Fernلndez، نويسنده , , E. and Bّrresen، نويسنده , , B.T. and Rytter، نويسنده , , E. and Gabis، نويسنده , , I.E. and Yartys، نويسنده , , V.A.، نويسنده ,
Abstract :
Phase transformations during dynamic dehydrogenation of Ti1−xVxH2 (x = 0.1; 0.2; 0.3) were studied using in situ Synchrotron X-Ray Diffraction (SR XRD) and non-isothermal kinetics experiments. The main dehydrogenation path for γ-Ti1−xVxH2 was found to be γ → δ → β → βalloy. Body-centred tetragonal δ-hydride was found to be an intermediate phase of the γ → β transformation in Ti0.8–0.9V0.1–0.2H2. TDS, in situ SR XRD and isoconversional kinetics studies showed that hydrogen desorption from Ti1−xVxH2 is composed of simultaneous reactions taking place between 300 and 600 °C. The effective activation energy of hydrogen desorption depends on the vanadium contents and the reaction pathway, increasing from 21 kJ/mol H2 (γ → δ) to 60–110 kJ/mol H2 (δ → β).
Keywords :
In situ synchrotron X-ray diffraction , Titanium , vanadium , metal hydride , Isoconversional kinetics , Thermal desorption spectroscopy
