High-pressure studies of the TiCr1.8–H2 system Statistical thermodynamics above the critical temperature

Sieverts apparatus and methodology for accurate determination of hydrogen uptake by light-atom hosts

“…Furthermore, the X-ray density of a new starting material may not be known until a structure determination has been done, a problem compounded by any change in the sample density owing to hydrogen uptake. The sample volume problem has been pointed out before [4] in the context of high-pressure measurements, but we show here that the problem also occurs at pressures of a few bar.…”

“…As the effect of uncertain Z is very small compared to the effect of the ±25% assumed uncertainty in sample density, this comparison demonstrates that the density problem is very significant compared to the likely uncertainties in p, T and Z, which should all be kept small compared to 1% by design anyway to ensure high-quality results. Regarding the effect of an inaccurate volume calibration [4], inspection of Eq. (1) shows that the change in H/X in every step depends on the absolute Fig.…”

Analysis of hydride formation for hydrogen storage: Pressure–composition isotherm curves modeling

“…On one side in 1937, Lacher [7] found some mathematical expressions based on the interstitial site occupation to fit isothermal curves of the logarithm of hydrogen gas pressure as a function of the hydrogen concentration in the metal. To extend this work, Beeri et al [8], Samsum et al [9], Feng et al [10] and Lototsky et al [11] gave more efficiency expressions to fit better these PCI curves. In 2003, Beeri et al [12] extended their studies to the case of double plateau, which corresponds to two consecutive phase transformations and is outside of our purpose.…”

Effect of stoichiometry on hydrogen storage performance of Ti–Cr–VFe based alloys

“…Compared with the first and second generations, the third generation alloys have higher hydrogen storage capacity. TiCr based alloys have been given great attention in recent 10 years for its low cost and simple processing methods [9,10].…”