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.
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页码：152 / 156
页数：5
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