Hydrogen and deuterium sorption by selected rare earth intermetallic compounds at pressures up to 1500 atm

TLDR: A limited survey of hydrogen and deuterium sorption by 13 selected AB itx alloys (A  La, Ce, Pr, Er; B ǫ Co, Ni, La 0.45 Ce 0.55 Ni 5 and Lao 0.5 Co 5 ) was conducted in this paper.

Abstract: A limited survey was conducted of hydrogen and deuterium sorption by 13 selected AB itx alloys (A  La, Ce, Pr, Er; B  Co, Ni). A structural analysis showed that AB 5 hydrides (PrCo 5 H 3.9 and LaNi 5 H 6 are paradigms) share essentially the same structure, with a maximum of nine sites per AB 5 unit available for hydrogen storage. To determine whether all nine sites could be filled at pressures higher than those previously studied, pressure-composition isotherms were obtained at 21 °C and up to 1500 atm for each of the alloys under study. The greatest hydrogen absorption occurred for LaCo 5 , La 0.45 Ce 0.55 Ni 5 and Lao.5Ce 0.5 Co 5 with 9, 8.3 and 8.5 hydrogen atoms per mole of alloy respectively. The effect on the pressure-composition isotherm of substituting one A or B element for another (neodymium or manganese) who also explored. The pressure plateaus were usually shifted by these substitutions.