Hydrides and deuterides of CaNi5

An in-situ neutron diffraction study of the ageing of CaNi5Dx at 80°C and 9bar

“…The ␣ /␤ plateau pressure in the CaNi 5 H x phase diagram is approximately 3.6 bar at 80 • C [4]. Manometric investigation of the deuteride at 25 • C shows no pronounced isotope effect, and it is assumed that at 80 • C, the corresponding plateau pressure will be close to that of the hydride.…”

“…Previous experimental studies of the so named 'disproportionation' process in AB 5 [4]. However, while the evidence for B (in metallic form) continues to increase, the evidence of any intermetallic A x B y H z or AH x phases remains weak and inconclusive.…”

“…Although not rare-earth based, under more moderate conditions of temperature and pressure, the CaNi 5 system displays a loss of RHC [4,[6][7][8] that is much more rapid than the LaNi 5 system. Loss of RHC during the storage of CaNi 5 H x at various temperatures is reported in [9].…”

“…The CaNi 5 H(D) x system displays a phase diagram with three plateaus [4]. Neutron diffraction measurements [5] have identified the dilute concentration hexagonal ␣ phase (CaNi 5 D 0.3 ) in P6/mmm, the two intermediate concentration orthorhombic phases ␣ (CaNi 5 D 0.9 ) and ␤ (CaNi 5 D 4.8 ), both in Im2m, and the concentrated trigonal ␥ phase (CaNi 5 D 6.1 ) in P31m.…”

Nanoscale Energy Storage Materials Produced by Hydrogen‐Driven Metallurgical Reactions

“…HDMR reactions were successfully used to prepare Li anodes and may also provide a convenient route for the synthesis of improved hydrogen storage compounds. [14] 2 CaNi 5 + H 2 6 CaH 2 + 5Ni 500 DR [15] 3 2Mg 2 Cu + 3H 2 6 3MgH 2 + MgCu 2 250 DR [12] 4 Ti 2 Cu + 2H 2 6 2TiH 2 + Cu 500 DR [16] 5 NaAlH 4 6 1/3Na 3 AlH 6 + 2/3Al + H 2 125 DR [11] 6 Na 3 AlH 6 6 3NaH + Al + 3H 2 150 DR [11] …”