Synchrotron powder diffraction Rietveld refinement of MgB20 crystal structure

被引：28

作者：

Brutti, S

Colapietro, M

Balducci, G

Barba, L

Manfrinetti, P

Palenzona, A

机构：

[1] Univ Roma La Sapienza, Dipartimento Chim, I-00185 Rome, Italy

[2] CNR, Ist Cristallog, Sez Monterotondo Sinerotrone Triste SCpA, I-34012 Trieste, Italy

[3] Univ Genoa, INFM, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

来源：

INTERMETALLICS | 2002年 / 10卷 / 08期

关键词：

intermetallics; miscellaneous; crystallography; crystal chemistry of intermetallics;

D O I：

10.1016/S0966-9795(02)00060-2

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 crystal structure of MgB20 has been investigated by X-ray and synchrotron powder diffraction at room temperature. As it happens in other metal-boron systems, the Rietveld refinement of this magnesium boron-rich phase shows a structure derived directly from beta-boron. The substantially unaltered B-B framework hosts magnesium atoms in three different atomic positions (D, E and F holes); the occupancy of these sites is partial. The resulting unit cell is trigonal with space group R (3) over barm, the refined hexagonal axes a = 1.09830(4) and c = 2.41561(15) nm. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：811 / 817

页数：7

共 31 条

[1] High Tc superconductivity in a critical range of micro-strain and charge density in diborides [J].