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DyIrSn and the Lu3Co2In4-type stannides Sm3Rh2Sn4 and RE 3Ir2Sn4 (RE = Y, Sm, Gd–Tm, Lu)
Zeitschrift für Naturforschung B ( IF 0.8 ) Pub Date : 2024-02-23 , DOI: 10.1515/znb-2024-0004 Lars Schumacher 1 , Aylin Koldemir 1 , Rainer Pöttgen 1
Zeitschrift für Naturforschung B ( IF 0.8 ) Pub Date : 2024-02-23 , DOI: 10.1515/znb-2024-0004 Lars Schumacher 1 , Aylin Koldemir 1 , Rainer Pöttgen 1
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The Lu3 Co2 In4 -type stannides RE 3 Ir2 Sn4 (RE = Y, Sm, Gd–Tm, Lu) were synthesized from the elements by arc-melting and subsequent annealing sequences in sealed silica ampoules. For a more comprehensive phase analytical study, the isotypic stannide Sm3 Rh2 Sn4 and the ZrNiAl-type stannides DyIrSn and LT-YIrSn were also obtained. The polycrystalline samples were characterized through their X-ray powder patterns. The structures of DyIrSn and Gd3 Ir2.63(2) Sn3.37(2) (ZrNiAl type, space group P 6‾2m ), Sm3 Ir2.52(2) Sn3.48(1) , Gd3 Ir2.49(1) Sn3.51(1) and Tm3 Ir2.20(3) Sn3.80(3) (Lu3 Co2 In4 type, space group P 6‾) were refined from single-crystal X-ray diffractometer data, revealing residual Ir/Sn disorder in the low-symmetry variants. The RE 3 Ir2 Sn4 stannides are derived from the equiatomic stannides RE IrSn (≍RE 3 Rh3 Sn3 ) by partial Ir/Sn substitution. The symmetry reduction from space group P 6‾2m to P 6‾ is forced by the Ir/Sn ordering within the RE 6 trigonal prisms. The new Sn2 position shows the rare motif of a trigonal planar tin coordination with 289 pm Sn2–Sn1 distances (data for Gd3 Ir2.49(1) Sn3.51(1) ). 119 Sn Mössbauer spectra confirm the two crystallographically independent tin sites in Tm3 Ir2 Sn4 and the structural disorder in Gd3 Ir2 Sn4 .
更新日期：2024-02-23
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