This title appears in the Scientific Report : 2015 

Crystal structure and Mössbauer studies of the isotypic Fe$_{6}$-cluster compounds RE$_{15}$[Fe$_{8}$C$_{25}$], RE=Dy, Ho
Davaasuren, Bambar
Dashjav, Enkhtsetseg / Kreiner, Guido / Borrmann, Horst / Weber, Sven-Ulf / Becker, Klaus-Dieter / Jochen Litterst, Fred / Kniep, Rüdiger (Corresponding author)
Werkstoffsynthese und Herstellungsverfahren; IEK-1
Journal of solid state chemistry, 225 (2015) S. 450 - 454
Orlando, Fla. Academic Press 2015
Journal Article
Electrochemical Storage
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The carboferrates RE15[Fe8C25] (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 Er15[Fe8C25] (hP48, P321). The main feature of the crystal structure is given by Fe6 cluster units characterized by covalent Fe–Fe bonding interactions. 57Fe Mössbauer spectra of Dy15[Fe8C25] 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.