The crystal structure of aluminum doped β-rhombohedral boron

被引：6

作者：

Bykova, Elena ^{[1
,2
]}

Parakhonskiy, Gleb ^{[1
,2
]}

Dubrovinskaia, Natalia ^{[1
]}

Chernyshov, Dmitry ^{[3
]}

Dubrovinsky, Leonid ^{[2
]}

机构：

[1] Univ Bayreuth, Inst Phys, Lehrstuhl Kristallog, D-95440 Bayreuth, Germany

[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[3] European Synchrotron Radiat Facil, Swiss Norwegian Beam Line, F-38043 Grenoble, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 194卷

关键词：

Boron; Aluminum; Crystal structure; X-ray diffraction; High-pressure synthesis; SOLID-SOLUTION; X-RAY; IRON;

D O I：

10.1016/j.jssc.2012.05.011

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A crystal structure of aluminum doped beta-rhombohedral boron was studied by single-crystal X-ray diffraction at 80 K. The crystals were synthesized using high-pressure high temperature technique at 3 GPa and 2100 K. The structure is based on three-dimensional framework made of B-12 icosahedra with voids occupied by the B-28-B-B-28 units, it has the R-3m space group with a = 10.9014(3), c = 23.7225(7) A lattice dimensions in hexagonal setting. Aluminum atoms are located in A1 and D special positions of the beta-B structure with occupancies of 82.7(6)% and 11.3(4)%, respectively. Additional boron atoms are located near the D-site. Their possible distribution is discussed. Finally we have found two appropriate structural models whose refinement suggests two possible chemical compositions, AlB44.8(5) and AlB37.8(5), which are in a good agreement with the chemical analysis data obtained from EDX. The crystal structure of AlB44.8(5) is described in detail. (c) 2012 Elsevier Inc. All rights reserved.

引用

页码：188 / 193

页数：6

共 34 条

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