Structural investigation and hydrogen capacity of YMg2Ni9 and (Y0.5Ca0.5)(MgCa)Ni9:: new phases in the AB2C9 system isostructural with LaMg2Ni9

被引：185
|
作者：
Kadir, K [1 ]
Sakai, T [1 ]
Uehara, I [1 ]
机构：
[1] Osaka Natl Res Inst, Ikeda, Osaka 563, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 287卷 / 1-2期
关键词：
hydrogen storage alloy; X-ray diffraction; pressure-composition isotherms; crystal structure;
D O I：
10.1016/S0925-8388(99)00041-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
New ternary magnesium-based alloys, YMg2Ni9 and (Y0.5Ca0.5)(MgCa)Ni-9 have been synthesized and their crystal structures were determined by Guinier-Hagg X-ray powder diffraction. The compounds are a hexagonal and isostructural with LaMg2Ni9 (AB(2)C(9) type), in which Y is uniquely at the A site as in YMg2Ni9, and Ca partially occupies both A and B sites. The hydrogen absorption/desorption properties were determined by pressure-composition isotherms. 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 Science S.A. All rights reserved.
引用
收藏
页码：264 / 270
页数：7
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