Quaternary intermetallics RE 2Pt3Ga4In (RE=Y, Gd-Tm) – intergrowth structures of NdRh2Sn4 and TiNiSi related slabs
| Autor: | Maximilian Kai Reimann, Jutta Kösters, Rainer Pöttgen, Vasyl' I. Zaremba, Myroslava Horiacha |
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| Rok vydání: | 2020 |
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| Zdroj: | Zeitschrift für Kristallographie - Crystalline Materials. 235:117-125 |
| ISSN: | 2196-7105 2194-4946 |
| Popis: | The quaternary gallium-rich intermetallic phases RE 2Pt3Ga4In with RE = Y and Gd-Tm were synthesized by arc-melting of the elements and subsequent annealing. Small single crystals were obtained by high-frequency annealing of the samples in sealed tantalum ampoules. The polycrystalline samples were characterized through their X-ray powder patterns. The RE 2Pt3Ga4In phases crystallize with a site ordering variant of the orthorhombic Y2Rh3Sn5 type, space group Cmc 21. The structures of Gd2Pt3Ga4In, Dy2Pt3Ga4.14In0.86, Er2Pt3Ga4.17In0.83 and Tm2Pt3Ga4.21In0.79 were refined from single-crystal X-ray diffraction data. The single crystals reveal small homogeneity ranges RE 2Pt3Ga4±xIn1±x. The striking geometrical structural building units are slightly distorted trigonal prisms around the three crystallographically independent platinum atoms: Pt1@RE 4Ga2, Pt2@RE 2Ga4 and Pt3@RE 2Ga2In2. Based on these prismatic building units, the RE 2Pt3Ga4In structures can be described as intergrowth variants of TiNiSi and NdRh2Sn4 related structural slabs. Temperature dependent magnetic susceptibility studies of Gd2Pt3Ga4In and Tb2Pt3Ga4In show Curie-Weiss behavior and the experimental magnetic moments confirm stable trivalent gadolinium respectively terbium. Gd2Pt3Ga4In and Tb2Pt3Ga4In order antiferromagnetically at T N = 15.8(1) and 26.0(1) K. Magnetization curves at 3 K show field-induced spin reorientations. |
| Databáze: | OpenAIRE |
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