Abstract
The compounds of the REPt6Al3 series (RE = Ce–Nd, Sm, Gd, Tb) were obtained by reaction of the elements via arc‐melting. They were characterized by powder and single‐crystal X‐ray diffraction (NdPt6Al3: wR = 0.0432, 759 F2 values, 33 variables) as well as by magnetic susceptibility measurements. The isostructural compounds crystallize with a new structure type in the trigonal crystal system with space group R3c, twelve formula units in the unit cell, and lattice parameters of a = 752–755 and c = 3882–3945 pm. The crystal structure can be described by different slabs stacked along [001]. One layer features Pt3 triangles, centering the cavities of a flat honeycomb RE layer that are arranged in a ···ABCA′B′C′··· sequence. The other layer consists of condensed hexagonal [Pt6Al6] prisms, centered by Pt atoms, separating the before mentioned slabs. Magnetic measurements revealed that all rare‐earth atoms are in the trivalent oxidation state, however, due to the low lanthanoide content magnetic ordering phenomena were observed only at low temperatures [SmPt6Al3: TC = 5.0(1) K; GdPt6Al3: TC = 7.3(1) K; TbPt6Al3: TN = 3.6(1) K].
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