K. Kadir et al., Structural investigation and hydrogen capacity of YMg2Ni9 and (Y0.5Ca0.5)(MgCa)Ni-9: new phases in the AB(2)C(9) system isostructural with LaMg2Ni9, J ALLOY COM, 287(1-2), 1999, pp. 264-270
New ternary magnesium-based alloys, YMg2Ni9 and (Y0.5Ca0.5)(MgCa)Ni-9 have
been synthesized and their crystal structures were determined by Guinier-Ha
gg X-ray powder diffraction. The compounds are a hexagonal and isostructura
l with LaMg2Ni9 (AB(2)C(9) type), in which Y is uniquely at the A site as i
n YMg2Ni9, and Ca partially occupies both A and B sites. The hydrogen absor
ption/desorption properties were determined by pressure-composition isother
ms. YMg2Ni9 does not absorb hydrogen,whereas (Y0.5Ca0.5)(MgCa)Ni-9 absorbs
similar to 2 wt.% H-2 at similar to 3.3 MPa and 263 K. (C) 1999 Elsevier Sc
ience S.A. All rights reserved.