“…Although some of the properties of the RNi 5 X (R = La, Ce, Nd; X = In, Sn) intermetallic compounds with the hexagonal CeNi 5 Sn-type structure are well documented in literature [5,6], only two works have presented thermodynamic data for the corresponding hydrides [5,7]. We have recently reported the results of the Pressure-Composition-Temperature (P-C-T) characterisation of the LaNi 5 Sn-H 2 system [7].…”