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Title: Crystal structure and Mössbauer studies of the isotypic Fe{sub 6}-cluster compounds RE{sub 15}[Fe{sub 8}C{sub 25}], RE=Dy, Ho

The carboferrates RE{sub 15}[Fe{sub 8}C{sub 25}] (RE=Dy, Ho) were prepared from mixtures of the elements by arc-melting followed with subsequent annealing at 1373 K. The crystal structures were determined from single crystal X-ray diffraction data and revealed an isotypic relationship to Er{sub 15}[Fe{sub 8}C{sub 25}] (hP48, P321). The main feature of the crystal structure is given by Fe{sub 6} cluster units characterized by covalent Fe–Fe bonding interactions. {sup 57}Fe Mössbauer spectra of Dy{sub 15}[Fe{sub 8}C{sub 25}] were fitted by three subspectra with relative spectral weights of about 3:3:2 which is in general agreement with the crystal structure. Below 50 K, an onset of magnetic hyperfine fields at the three iron sites is observed which is supposed to be caused by dipolar fields arising from neighboring, slowly relaxing Dy magnetic moments. - Graphical abstract: Fe{sub 6}-cluster in the crystal structure of RE{sub 15}[Fe{sub 8}C{sub 25}], RE=Dy, Ho. - Highlights: • New carboferrates RE{sub 15}[Fe{sub 8}C{sub 25}] with RE=Dy, Ho have been synthesized. • The crystal structures were refined using single crystal X-ray data. • An orientational relationship between Fe{sub 6}-clusters and Fe in γ-Fe is outlined. • {sup 57}Fe Mössbauer spectra are in agreement with structural data from X-rays. • Magneticmore » hyperfine fields below 50 K are explained by dipolar fields from Dy atoms.« less
Authors:
; ; ;  [1] ; ;  [2] ;  [3] ;  [1]
  1. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden (Germany)
  2. Braunschweig University of Technology, Institute of Physical and Theoretical Chemistry, Hans-Sommer Str. 10, 38106 Braunschweig (Germany)
  3. Braunschweig University of Technology, Institute for Physics of Condensed Matter, Mendelssohn Str. 3, 38106 Braunschweig (Germany)
Publication Date:
OSTI Identifier:
22475626
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 225; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; ANNEALING; COVALENCE; DYSPROSIUM COMPOUNDS; HOLMIUM COMPOUNDS; IRON 57; IRON CARBIDES; MAGNETIC MOMENTS; MELTING; MOESSBAUER EFFECT; MONOCRYSTALS; TEMPERATURE DEPENDENCE; TRIGONAL LATTICES; X-RAY DIFFRACTION