High-pressure synthesis and crystal structures of new ternary caesium magnesium hydrides, CsMgH3, Cs4Mg3H10 and Cs2MgH4

被引：35

作者：

Bertheville, B

Fischer, P

Yvon, K ^{[1
]}

机构：

[1] Univ Geneva, Lab Cristallog, Geneva, Switzerland

[2] Paul Scherrer Inst, Lab Neutronenstreuung, CH-5232 Villigen, Switzerland

[3] ETH Zurich, CH-5232 Villigen, Switzerland

[4] Griffith Univ, Sch Sci, Brisbane, Qld 4111, Australia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 330卷

关键词：

CsMgH3; Cs4Mg3H10; Cs2MgH4; high-pressure phase; caesium magnesium hydrides; neutron powder diffraction; crystal structure;

D O I：

10.1016/S0925-8388(01)01631-0

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：

The title compounds were synthesized by heating stoichiometric mixtures of the binary hydrides (deuterides) to 820 K in a multi-anvil press at 30 kbar pressure. X-ray and neutron powder diffraction on the deuterides at ambient conditions indicates rhombohedral symmetry for CsMgH3 (space group R-3m, a=6.2521(6), c=22.382(3) Angstrom, BaRuO3 type structure), orthorhombic symmetry for Cs4Mg3H10 (Cmca, a = 6.2569 (9), b = 14.743 (2), c = 13.791(2) Angstrom, Cs4Mg3F10 type structure), and tetragonal symmetry for Cs2MgH4 (I4/mmm, a = 4.3264(5), c = 14.760(2) Angstrom, K2NiF4 type structure). The compounds contain octahedral [MgH6](4-) anions and have considerably better volume efficiencies for hydrogen storage than those containing tetrahedral [MgH4](2-) anions that are synthesised under hydrogen gas pressure. (C) 2002 Elsevier Science BY All rights reserved.

引用

页码：152 / 156

页数：5

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