ChemInform Abstract: CeMnAlH_x, a New Metal Hydride.

Abstract

CeMnAlHx, a New Metal Hydride.-The new title hydride is prepared by hydrogenation of CeMnAl alloys crystallizing as cubic C15 Laves phase (Fdr3rm, MgCu 2 structure type) with random Al-Mn distribution on the B sites of this AB 2 -type phase. At low pressure (¡ 10 mbar) a stable hydride phase is formed absorbing about 1.2 H/formula unit (f.u.) and up to 2.4 H/f.u. is absorbed at 300 K and pressures ¿ 10 mbar. The C15 structure is maintained upon hydride (deuteride) formation and the D atoms in CeMnAlDx occupy only the 2A-2B-tetrahedral interstitial sites over the concentration range 0.0 ¡ x ≤ 2.5. -(SPATZ, P.; GROSS, K.; ZUETTEL, A.; FAUTH, F.; FISCHER, P.; SCHLAPBACH, L.; J. Alloys Compd. 261 (1997) 1-2, 263-268; Inst. Phys., Univ. Fribourg, CH-1700 Fribourg, Switz.; EN)