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

Authors
Kadir, K Sakai, T Uehara, I
Citation
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
Citations number
28
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
287
Issue
1-2
Year of publication
1999
Pages
264 - 270
Database
ISI
SICI code
0925-8388(19990601)287:1-2<264:SIAHCO>2.0.ZU;2-T
Abstract
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.