The structure of the Y-phase in the Mg-Ni-Sn system

被引：6

作者：

Boudard, M

Bordet, P

Vincent, H

Audebert, F

机构：

[1] Univ Grenoble 1, CNRS, INPG, LTPCM,ENSEEG,UMR 5614, F-38402 St Martin Dheres, France

[2] CNRS, Lab Cristallog, F-38042 Grenoble 9, France

[3] CNRS, INPG, LMGP, ENSPG, F-38402 St Martin Dheres, France

[4] Univ Buenos Aires, Fac Ingn, Grp Mat Avanzados, RA-C1063ACV Buenos Aires, DF, Argentina

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 372卷 / 1-2期

关键词：

intermetallics; crystal structure and symmetry; X-ray diffraction;

D O I：

10.1016/j.jallcom.2003.09.142

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 structure of the Y-phase in the Mg-Ni-Sn system with Mg74.5Ni14.5Sn11 composition was solved by applying the direct methods refined by a standard least square procedure. The space group is Ndegrees 101 (P4(2) cm) and the magnitude of the cell parameters are a = b = 9.851(2) Angstrom and c = 6.868(2) Angstrom. The final reliability factor is R = 0.04 for 1575 independent reflections. The structure can be described in terms of an ideal structure containing two chains of cubes of Mg aligned along the c-direction. In each chain, Sn (resp. Ni) atoms occupy different opposite faces for adjacent cubes forming a stacking of tetrahedra along the c-direction. An alternative description in terms of two distorted polyhedral units is also given and the structure is compared with related inter-metallic compounds. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：121 / 128

页数：8

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