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- Title
Crystal Structure, Spectroscopic Investigations, and Physical Properties of the Ternary Intermetallic REPt2Al3 (RE = Y, Dy–Tm) and RE2Pt3Al4 Representatives (RE = Tm, Lu).
- Authors
Eustermann, Fabian; Gausebeck, Simon; Dosche, Carsten; Haensch, Mareike; Wittstock, Gunther; Janka, Oliver
- Abstract
The <italic>RE</italic>Pt2Al3 compounds of the late rare-earth metals (<italic>RE</italic> = Y, Dy–Tm) were found to crystallize isostructural. Single-crystal X-ray investigations of YPt2Al3 revealed an orthorhombic unit cell (<italic>a</italic> = 1080.73(6), <italic>b</italic> = 1871.96(9), <italic>c</italic> = 413.04(2) pm, <italic>wR</italic>2 = 0.0780, 942 F2 values, 46 variables) with space group <italic>Cmmm</italic> (<italic>oC</italic>48; <italic>q</italic>2<italic>pji</italic>2<italic>hedb</italic>). A comparison with the Pearson database indicated that YPt2Al3 forms a new structure type, in which the Pt and Al atoms form a [Pt2Al3]<italic>δ</italic>− polyanion and the Y atoms reside in the cavities within the framework. Via a group-subgroup scheme, the relationship between the PrNi2Al3-type structure and the new YPt2Al3-type structure was illustrated. The compounds with <italic>RE</italic> = Dy–Tm were characterized by powder X-ray diffraction experiments. While YPt2Al3 is a <italic>Pauli</italic>-paramagnet, the other <italic>RE</italic>Pt2Al3 (<italic>RE</italic> = Dy–Tm) compounds exhibit paramagnetic behavior, which is in line with the rare-earth atoms being in the trivalent oxidation state. DyPt2Al3 and TmPt2Al3 exhibit ferromagnetic ordering at <italic>T</italic>C = 10.8(1) and 4.7(1) K and HoPt2Al3 antiferromagnetic ordering at <italic>T</italic>N = 5.5(1) K, respectively. Attempts to synthesize the isostructural lutetium compound resulted in the formation of Lu2Pt3Al4 (Ce2Ir3Sb4-type, <italic>Pnma</italic>, <italic>a</italic> = 1343.4(2), <italic>b</italic> = 416.41(8), <italic>c</italic> = 1141.1(2) pm), which could also be realized with thulium. The structure was refined from single-crystal data (<italic>wR</italic>2 = 0.0940, 1605 F2 values, 56 variables). Again, a polyanion with bonding Pt–Al interactions was found, and the two distinct Lu atoms were residing in the cavities of the [Pt3Al4]<italic>δ</italic>– framework. X-ray photoelectron spectroscopy (XPS) measurements were conducted to examine the electron transfer from the rare-earth atoms onto the polyanionic framework.
- Subjects
INTERMETALLIC compounds; CRYSTAL structure research; SINGLE crystals spectra; CRYSTALLOGRAPHY
- Publication
Crystals (2073-4352), 2018, Vol 8, Issue 4, p169
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst8040169