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Article
Ladders of a Magnetically Active Element in the Structure of the Novel Complex Boride Ti9Fe2Ru18B8: Synthesis, Structure, Bonding, and Magnetism
Inorganic Chemistry
  • Boniface P.T. Fokwa, RWTH-Aachen University
  • German D. Samolyuk, RWTH-Aachen University
  • Gordon J. Miller, Iowa State University
  • Richard Dronskowski, RWTH-Aachen University
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-2008
DOI
10.1021/ic7020963
Abstract
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) Å, and the Fe2−Fe2 distance between two dumbbells is 2.968(1) Å; in contrast, the chains are well-separated from each other by distances of at least 11.217(2) Å. 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 Fe2 dimers along the c axis as the origin of the magnetic behavior.
Comments

Reprinted (adapted) with permission from Inorg. Chem., 2008, 47 (6), pp 2113–2120. Copyright 2008 American Chemical Society.

Copyright Owner
American Chemical Society
Language
en
File Format
application/pdf
Citation Information
Boniface P.T. Fokwa, German D. Samolyuk, Gordon J. Miller and Richard Dronskowski. "Ladders of a Magnetically Active Element in the Structure of the Novel Complex Boride Ti9Fe2Ru18B8: Synthesis, Structure, Bonding, and Magnetism" Inorganic Chemistry Vol. 47 Iss. 6 (2008) p. 2113 - 2120
Available at: http://works.bepress.com/gordon-miller/61/