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Miletić, Goran; Šorgić, Božica; Drašner, Antun; Blažina, Ž.

doi:10.1023/a:1010922822907

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The maximum hydrogen content in this system is H/HoNi 5 ¼ 2:0 at 248 K, which is smaller than that of ternary HoNi 5Àx M x compounds (M ¼ Al, Gd; x ¼ 0:5, 1.0). 9,10) During hydrogen desorption, a single pressure plateau due to the phase transition can be observed. Reversible hydrogen content is present during hydrogen absorption and desorption.…”

Section: Resultsmentioning

confidence: 99%

Appearance of a Novel Pressure Plateau in RNi<SUB>5</SUB>-H (R = Rare Earth) Systems

et al. 2005

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We investigated the hydrogen storage properties in a HoNi 5 -H system combined with TbNi 5 -H and DyNi 5 -H systems. Pressurecomposition (P-C) isotherms in the HoNi 5 -H system show one reversible pressure plateau during hydrogen absorption and desorption with a hysteretic phase transition. The maximum hydrogen storage capacity was found to be H/HoNi 5 ¼ ca. 2, and no second plateau similar to that observed in other RNi 5 -H (R: rare earth) systems was observed, even at 196 K. Two pressure plateaux found in light rare earth-based R L Ni 5 -H (R L ¼ La, Pr, Nd, Sm and Gd) systems tend to disappear in TbNi 5 -H and DyNi 5 -H systems and are scarcely present in HoNi 5 -H system. On the other hand, a novel pressure plateau appears at low hydrogen content in these systems due to the presence of a new hydride phase, and the plateau region extends from TbNi 5 -H and DyNi 5 -H to HoNi 5 -H systems. Contrary to the other plateaux, the pressures of the novel plateau during both hydrogen absorption and desorption decrease with decreasing unit cell volume of RNi 5 compounds or with increasing atomic number of the R element in RNi 5 -H systems. To clarify the effect of 4f electrons in the R element in RNi 5 -H systems on the novel plateau, we have evaluated the hydrogen storage properties in an YNi 5 -H system. Our results show that YNi 5 compound with lattice constants similar to those of TbNi 5 and DyNi 5 compounds has a similar P-C isotherm, suggesting that 4f electrons has no direct influence on the appearance of the novel plateau.

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