CA4MG4CO3H19 AND YB4MG4CO3H19, CONTAINING ORIENTATIONALLY DISORDERED SQUARE-PYRAMIDAL [COH5](4-) ANIONS

被引：10

作者：

HUANG, B

YVON, K

FISCHER, P

机构：

[1] ETH ZURICH,NEUTRONENSTREUUNG LAB,CH-5232 VILLIGEN PSI,SWITZERLAND

[2] PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1995年 / 227卷 / 02期

关键词：

QUATERNARY METAL HYDRIDES; NEUTRON POWDER DIFFRACTION; COBALT HYDRIDE COMPLEXES; COMPLEX METAL HYDRIDES;

D O I：

10.1016/0925-8388(95)01647-3

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 hydrides and their deuterides were synthesized by a solid state reaction at 790-800 K and 120-155 bar hydrogen (deuterium) pressure, and characterized by X-ray single-crystal (Ca compound) and neutron powder diffraction (Ca and Yb compounds). They crystallize with cubic symmetry, space group P (4) over bar 3m, Ca4Mg4Co3H19: a = 6.6953(2) Angstrom, deuteride: 6.6809(2) Angstrom; Yb4Mg4Co3H19: a = 6.6727(2) Angstrom, deuteride: 6.6591(1) Angstrom (T = 295 K). The structures contain tetrahedrally coordinated D- anions with bond distances [D3-Mg] = 1.912(5) Angstrom (Ca) and 1.902(7) Angstrom (Yb), [D3-3Ca)] = 2.355(6) Angstrom and [D3-3Yb] = 2.354(5) Angstrom, and square-pyramidal [CoD5](4-) complex anions in which the equatorial ligands are ordered with bond distances [Co-4D1] = 1.546(3) (Ca). 1.535(5) Angstrom (Yb) and the apical ligands are disordered with bond distances [Co-D2] = 1.586(9) (Ca), 1.60(1) Angstrom (Yb).

引用

页码：116 / 120

页数：5

共 15 条

[1]

[Anonymous], 1992, J NEUTRON RES, DOI [10.1080/10448639208218770, DOI 10.1080/10448639208218770]

[2]

CERNY R, 1992, J ALLOY COMPD, V187, P227

[3] TETRACALCIUM TRIMAGNESIUM TETRADECAHYDRIDE, CA4MG3H14 - THE 1ST TERNARY ALKALINE-EARTH HYDRIDE [J].