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

页码：264 / 270

页数：7

共 28 条

[1]

Burnasheva V. V., 1984, Russian Journal of Inorganic Chemistry, V29, P651

[2] CALCIUM-NICKEL INTERMETALLIC COMPOUNDS [J].

BUSCHOW, KHJ .

JOURNAL OF THE LESS-COMMON METALS, 1974, 38 (01) :95-98

[3]

HAHN T, 1989, INT TABLES CRYSTALLO, VA, P14

[4] AN AUTOMATIC MICRO-DENSITOMETER FOR X-RAY-POWDER DIFFRACTION PHOTOGRAPHS [J].

JOHANSSON, KE ;

PALM, T ;

WERNER, PE .

JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1980, 13 (12) :1289-1291

[5] Synthesis and structure determination of a new series of hydrogen storage alloys; RMg2Ni9 (R=La, Ce, Pr, Nd, Sm and Gd) built from MgNi2 laves-type layers alternating with AB(5) layers [J].

Kadir, K ;

Sakai, T ;

Uehara, I .

JOURNAL OF ALLOYS AND COMPOUNDS, 1997, 257 (1-2) :115-121

[6] STRUCTURAL STUDIES OF STACKING VARIANTS IN MG-BASE FRIAUF-LAVES PHASES [J].

KOMURA, Y ;

TOKUNAGA, K .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1980, 36 (JUL) :1548-1554

[7]

LANKER JF, 1982, J LESS-COMMON MET, V72, P87

[8]

Laves F., 1936, METALLWIRTSCHAFT, V15, P840

[9]

MUELLER W, 1986, METAL HYBRIDES

[10]

MUELLER WM, 1968, METAL HYBRIDE

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