Investigation on synthesis, characterization and hydrogenation behaviour of the La2Mg17 intermetallic

Abstract

Synthesis, structural characterization and hydrogenation behaviour of the La2Mg17 system have been investigated. One of the interesting results obtained is the hydrogen desorption at room temperature. For the first hydrogenation cycle, the as-synthesised intermetallic. La2Mg17, is activated up to 150 ± 10°C under hydrogen pressure, but no activation through heat treatment is needed for absorption-desorption for the second and subsequent cycles. The hydrogen desorption capacity of La2Mg17 is calculated by weight percentage and hydrogen capacity per mole of La2Mg17. The maximum value corresponds to 6.63% which represents one of the highest hydrogen capacities exhibited by a reversible intermetallic hydride system. © 1990.