Thermodynamic properties of LuCo3 hydrides

Add time:09/02/2019    Source:sciencedirect.com

Hydrogen desorption isotherms were measured in the system LuCo3Hx for [0 ⩽ x ⩽ 3.6 at temperatures of 0, 20, 40, 60 and 80°C. Pressure plateaux on the isotherms indicate the existence of two hydride phases in addition to the hydrogen-saturated metal α phase. The α and β phases exist over very narrow ranges of hydrogen concentration. At 20°C the plateau pressures are 647 Torr and 4202 Torr respectively, and the heats of absorption are −8.80 kcal (mol H2)−1 and −7.555 kcal (mol H2)−1 respectively for the α and β phases. From the temperature dependence of the isotherms, the partial molar heats and entropies of absorption and the heats and entropies of formation have been calculated as a function of x. The 20°C isotherm is compared with those of the other rare earth-Co3 hydrides.

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