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New members of the tetragonal RE14T3Al3 (RE = Sc, Y, Dy–Tm, Lu; T = Cu, Rh, Pd) series

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Abstract

The rare-earth metal-rich RE14T3Al3 series (RE = Y, Gd–Tm, Lu) was extended to the transition metals T = Cu, Rh, and Pd. All compounds have been prepared by arc-melting the rare-earth elements with appropriate amounts of TAl precursors. The compounds crystallize in the tetragonal Gd14Co3In2.7-type structure with space group P42/nmc. Two structures (Y14Rh2.97(1)Al3.03(1): a = 952.99(4) pm, c = 2292.98(10) pm, wR2 = 0.0423, 2225 F2 values, 63 variables; Y14Pd3.16(1)Al2.84(1): a = 955.06(5) pm, c = 2298.77(10) pm, wR2 = 0.0416, 2225 F2 values, 63 variables) have been refined from single-crystal data, indicating T/Al mixing on two crystallographic sites. The lattice parameters of all synthesized representatives have been refined from Guinier powder X-ray diffraction data. The Y and Lu containing compounds show Pauli paramagnetic behavior, indicating that the transition metal atoms have filled d bands and exhibit no localized magnetic moment. From the other compounds only Er14Pd3Al3 was obtained as an X-ray pure sample. It shows paramagnetism, in line with the rare-earth atoms in the trivalent oxidation state and antiferromagnetic ordering below TN = 8.0(1) K. Detailed magnetic investigations on the other members were impossible due to the presence of, e.g., RE3T trace impurities.

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Acknowledgements

We thank Dr. Rolf-Dieter Hoffmann and Dipl.-Ing. Jutta Kösters for the single-crystal intensity data collections.

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

    Frank Stegemann & Oliver Janka

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  1. Frank Stegemann
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  2. Oliver Janka
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Correspondence to Oliver Janka.

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Stegemann, F., Janka, O. New members of the tetragonal RE14T3Al3 (RE = Sc, Y, Dy–Tm, Lu; T = Cu, Rh, Pd) series. Monatsh Chem 150, 1175–1185 (2019). https://doi.org/10.1007/s00706-019-02434-2

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