Ladders of a magnetically active element in the structure of the novel complex boride Ti9Fe2Ru18B8:: Synthesis, structure, bonding, and magnetism

被引：40

作者：

Fokwa, Boniface P. T. ^{[1
]}

Samolyuk, German D. ^{[2
]}

Miller, Gordon J. ^{[2
]}

Dronskowski, Richard ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Inorgan Chem, D-52056 Aachen, Germany

[2] Iowa State Univ, US Dept Energy, Ames, IA 50011 USA

来源：

INORGANIC CHEMISTRY | 2008年 / 47卷 / 06期

关键词：

D O I：

10.1021/ic7020963

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Polycrystalline samples and single crystals of the complex boride Ti9Fe2Ru18B8 were synthesized by arc-melting the elements and characterized by single-crystal X-ray diffraction and energy-dispersive X-ray analysis. Ti9Fe2Ru18B8 is a new substitutional variant of the Zn11Rh18B8 structure type, space group P4/mbm (No. 127), whose remarkable feature is that it contains one-dimensional chains of dumbbells of magnetically active Fe atoms, which form "ladders" along the c axis. The Fe-Fe distance within a dumbbell is 2.489(2) angstrom, and the Fe-2-Fe-2 distance between two dumbbells is 2.968(1) angstrom; in contrast, the chains are well-separated from each other by distances of at least 11.217(2) angstrom. According to the results of tight-binding electronic structure calculations, Ru-B and Ti-Ru contacts are responsible for the structural robustness, while Fe-Fe interactions influence the magnetic behavior. According to magnetization measurements, Ti9Fe2Ru18B8 orders ferromagnetically between 10 and 200 K. A model for ferromagnetism in this ladder-based structure identifies ferromagnetic coupling among neighboring spin-triplet Fe-2 dimers along the c axis as the origin of the magnetic behavior.

引用

页码：2113 / 2120

页数：8

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