Abstract
The REPt2Al3 compounds of the late rare-earth metals (RE = Y, Dy–Tm) were found to crystallize isostructural. Single-crystal X-ray investigations of YPt2Al3 revealed an orthorhombic unit cell (a = 1080.73(6), b = 1871.96(9), c = 413.04(2) pm, wR2 = 0.0780, 942 F2 values, 46 variables) with space group Cmmm (oC48; q2pji2hedb). A comparison with the Pearson database indicated that YPt2Al3 forms a new structure type, in which the Pt and Al atoms form a [Pt2Al3]δ− 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 RE = Dy–Tm were characterized by powder X-ray diffraction experiments. While YPt2Al3 is a Pauli-paramagnet, the other REPt2Al3 (RE = 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 TC = 10.8(1) and 4.7(1) K and HoPt2Al3 antiferromagnetic ordering at TN = 5.5(1) K, respectively. Attempts to synthesize the isostructural lutetium compound resulted in the formation of Lu2Pt3Al4 (Ce2Ir3Sb4-type, Pnma, a = 1343.4(2), b = 416.41(8), c = 1141.1(2) pm), which could also be realized with thulium. The structure was refined from single-crystal data (wR2 = 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]δ– framework. X-ray photoelectron spectroscopy (XPS) measurements were conducted to examine the electron transfer from the rare-earth atoms onto the polyanionic framework.
Highlights
In the field of intermetallic compounds [1,2], some structure types are found with an impressive number of entries listed in the Pearson database [3]
The structures and physical properties of the equiatomic RETX (RE = rare-earth element, T = transition metal, X = element of group 12–15) representatives have been recently summarized in a series of review articles [10,11,12,13]
From a crystal chemical point of view, YNi2 Al3 is worth mentioning [16], because this compound can be considered to be an i3-superstructure of the PrNi2 Al3 -type structure
Summary
In the field of intermetallic compounds [1,2], some structure types are found with an impressive number of entries listed in the Pearson database [3]. The tetragonal body-centered ThCr2 Si2 -type (I4/mmm, >3250 entries) [8], the orthorhombic TiNiSi-type The structures and physical properties of the equiatomic RETX (RE = rare-earth element, T = transition metal, X = element of group 12–15) representatives have been recently summarized in a series of review articles [10,11,12,13]. Derived from the binary CaCu5 -type structure, two prototypic ternary representatives with different chemical compositions have been reported: the CeCo3 B2 - [14] and the PrNi2 Al3 -type [15]. From a crystal chemical point of view, YNi2 Al3 is worth mentioning [16], because this compound can be considered to be an i3-superstructure of the PrNi2 Al3 -type structure. From a basic research point of view, investigations of the magnetic ground state of the open f -shell rare-earth atoms are of great interest
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