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- Title
DyIrSn and the Lu<sub>3</sub>Co<sub>2</sub>In<sub>4</sub>-type stannides Sm<sub>3</sub>Rh<sub>2</sub>Sn<sub>4</sub> and RE<sub>3</sub>Ir<sub>2</sub>Sn<sub>4</sub> (RE = Y, Sm, Gd–Tm, Lu).
- Authors
Schumacher, Lars; Koldemir, Aylin; Pöttgen, Rainer
- Abstract
The Lu3Co2In4-type stannides RE3Ir2Sn4 (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 Sm3Rh2Sn4 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 Gd3Ir2.63(2)Sn3.37(2) (ZrNiAl type, space group P6‾2m), Sm3Ir2.52(2)Sn3.48(1), Gd3Ir2.49(1)Sn3.51(1) and Tm3Ir2.20(3)Sn3.80(3) (Lu3Co2In4 type, space group P6‾) were refined from single-crystal X-ray diffractometer data, revealing residual Ir/Sn disorder in the low-symmetry variants. The RE3Ir2Sn4 stannides are derived from the equiatomic stannides REIrSn (≍RE3Rh3Sn3) by partial Ir/Sn substitution. The symmetry reduction from space group P6‾2m to P6‾ is forced by the Ir/Sn ordering within the RE6 trigonal prisms. The new Sn2 position shows the rare motif of a trigonal planar tin coordination with 289 pm Sn2–Sn1 distances (data for Gd3Ir2.49(1)Sn3.51(1)). 119Sn Mössbauer spectra confirm the two crystallographically independent tin sites in Tm3Ir2Sn4 and the structural disorder in Gd3Ir2Sn4.
- Subjects
SPACE groups; SAMARIUM; X-ray diffractometers; TIN; MOSSBAUER spectroscopy
- Publication
Zeitschrift für Naturforschung B: A Journal of Chemical Sciences, 2024, Vol 79, Issue 2/3, p127
- ISSN
0932-0776
- Publication type
Article
- DOI
10.1515/znb-2024-0004