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New rare earth-rich aluminides and indides with cubic Gd4RhIn-type structure

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Abstract

The series of rare earth metal (RE)-rich intermetallics RE 4 TAl and RE 4 TIn (T = Ru, Rh, Ir) were synthesized by induction melting of the elements in sealed tantalum tubes. These compounds crystallize with the cubic Gd4RhIn-type structure, space group \(F\bar{4}3m\). The structures of eight crystals (including the isotypic compounds Ce4RuMg and Ce4RuCd) have been refined from X-ray single-crystal diffractometer data. The structures are composed of condensed RE 6 T trigonal prisms which form a rigid network with adamantane-like topology. Large cavities within these networks are filled with empty RE 6 octahedra and Al4, In4, Mg4, or Cd4 tetrahedra, respectively. Some of the RE 4 TAl and RE 4 TIn show small homogeneity ranges that result from small degrees of Al/T and In/T mixing on the 16e sites. All cerium compounds show small anomalies in the plots of the cell volumes. This is confirmed by temperature-dependent magnetic susceptibility measurements. Ce4RuMg, Ce4RuCd, Ce4RuAl, and Ce4RuIn show intermediate cerium valence and no magnetic ordering down to 3 K. Ce4RhAl shows essentially trivalent cerium.

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Acknowledgments

We thank Dipl.-Ing. U. Ch. Rodewald for the intensity data collections. This work was financially supported by the Deutsche Forschungsgemeinschaft.

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  1. Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149, Münster, Germany

    Frank Tappe, Christian Schwickert, Stefan Linsinger & Rainer Pöttgen

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  1. Frank Tappe
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  2. Christian Schwickert
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  3. Stefan Linsinger
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  4. Rainer Pöttgen
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Correspondence to Rainer Pöttgen.

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Tappe, F., Schwickert, C., Linsinger, S. et al. New rare earth-rich aluminides and indides with cubic Gd4RhIn-type structure. Monatsh Chem 142, 1087–1095 (2011). https://doi.org/10.1007/s00706-011-0622-3

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  • DOI: https://doi.org/10.1007/s00706-011-0622-3

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