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

Journal Article · Fri May 15 00:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.01.019· OSTI ID:22475626

Davaasuren, Bambar; Dashjav, Enkhtsetseg; Kreiner, Guido; Borrmann, Horst ^[1]; Weber, Sven-Ulf; Becker, Klaus-Dieter ^[2]; Jochen Litterst, Fred ^[3]; Kniep, Rüdiger ^[1]

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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)

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. • Magnetic hyperfine fields below 50 K are explained by dipolar fields from Dy atoms.

• OSTI ID: 22475626
• Journal Information: Journal of Solid State Chemistry, Vol. 225; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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