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Gallium–indium ordering in REPt2Ga3In (RE = Y, Gd–Yb) phases with NdRh2Sn4-type structure

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Abstract

The gallium-rich quaternary intermetallic compounds REPt2Ga3In (RE = Y, Gd–Yb) were synthesized by arc melting of the elements. Small single crystals were grown by induction heating the arc-melted buttons in sealed tantalum ampoules. The REPt2Ga3In phases were characterized through X-ray powder patterns. The structures of GdPt2Ga2.95In1.05 [a = 1760.28(4) pm, b = 429.09(5) pm, c = 675.37(14) pm, wR2 = 0.0618, 1104 F2 values, and 45 parameters] and TbPt2Ga3.14In0.86 [a = 1746.56(3) pm, b = 427.05(5) pm, c = 672.69(13) pm, wR2 = 0.0554, 1086 F2 values, and 45 parameters] were refined from X-ray single-crystal diffractometer data. These gallide indides are the first ternary ordered representatives of the orthorhombic NdRh2Sn4-type structure, space group Pnma. The striking basic building units are platinum-centered trigonal prisms Pt1@Gd2Ga4 and Pt2@Gd2Ga2In2 with larger edge lengths for the indium-substituted prism. Refinements of the occupancy parameters indicate the formation of small homogeneity ranges. The indium atoms are positioned at the edges of adjacent prisms and form zig-zag chains (330 pm In–In) extending along the y-axis. Temperature-dependent magnetic susceptibility data of GdPt2Ga3In show Curie–Weiss paramagnetism with an anomaly observed at T = 12.7(1) K, proven as intrinsic by zero-field heat capacity measurements, pointing towards a stable canted antiferromagnetic ground state.

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Acknowledgements

We thank Dipl.-Ing. Jutta Kösters and Dr. Rolf-Dieter Hoffmann for the single-crystal data collections. The research stay of MH in Münster was supported by the Deutscher Akademischer Austauschdienst.

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Authors and Affiliations

  1. Inorganic Chemistry Department, Ivan Franko National University of Lviv, Kyryla and Mephodiya Street 6, Lviv, 79005, Ukraine

    Myroslava Horiacha & Vasyl‘ I. Zaremba

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

    Myroslava Horiacha, Frank Stegemann & Rainer Pöttgen

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  1. Myroslava Horiacha
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  2. Vasyl‘ I. Zaremba
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  3. Frank Stegemann
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  4. Rainer Pöttgen
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Correspondence to Rainer Pöttgen.

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Horiacha, M., Zaremba, V.I., Stegemann, F. et al. Gallium–indium ordering in REPt2Ga3In (RE = Y, Gd–Yb) phases with NdRh2Sn4-type structure. Monatsh Chem 150, 1409–1415 (2019). https://doi.org/10.1007/s00706-019-02464-w

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