Synthesis, single-crystal structure refinement and Fe/T site preference in the ternary borides FexT7-xB3 (T = Ru, Rh; 0<x≤1.5)

被引：18
作者：
Fokwa, Boniface P. T. [1 ]
Dronskowski, Richard [1 ]
机构：
[1] Rhein Westfal TH Aachen, Inst Anorgan Chem, D-52056 Aachen, Germany
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 428卷 / 1-2期
关键词：
transition-metal alloys and compounds; solid-state reactions; crystal structure; X-ray diffraction;
D O I：
10.1016/j.jallcom.2006.03.079
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：
Single crystals of the borides FexRh7-xB3 (1 < x < 1.5) and FexRu7-xB3 (0 < x < 1) have been synthesized by arc-melting the elements in a water-cooled copper crucible under argon atmosphere. The silver-like products, structurally characterized by single-crystal X-ray analysis, adopt the hexagonal Th7Fe3 structure type (space group P6(3)mc, no. 186) with Z = 2. Their structures consist of layers of boron-centered trigonal prisms of rhodium or ruthenium (Rh;Ru) and iron on the one side, and one-dimensional channels of face-sharing octahedral (Rh;Ru)6 clusters on the other. Unlike in FeRh6B3, the iron substitution takes place at two (6c and 2b) of the three available rhodium/ruthenium positions, with a preference for the 6c site in the case of the FexRh7-xB3 compounds but not for FexRu7-xB3. (c) 2006 Elsevier B.V. All rights reserved.
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页码：84 / 89
页数：6
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