Abstract
The gallium-rich quaternary intermetallic compounds REPt2Ga3In (RE = Y, Gd–Yb) were synthesized by arc melting of the elements. Small single crystals were grown by induction heating the arc-melted buttons in sealed tantalum ampoules. The REPt2Ga3In phases were characterized through X-ray powder patterns. The structures of GdPt2Ga2.95In1.05 [a = 1760.28(4) pm, b = 429.09(5) pm, c = 675.37(14) pm, wR2 = 0.0618, 1104 F2 values, and 45 parameters] and TbPt2Ga3.14In0.86 [a = 1746.56(3) pm, b = 427.05(5) pm, c = 672.69(13) pm, wR2 = 0.0554, 1086 F2 values, and 45 parameters] were refined from X-ray single-crystal diffractometer data. These gallide indides are the first ternary ordered representatives of the orthorhombic NdRh2Sn4-type structure, space group Pnma. The striking basic building units are platinum-centered trigonal prisms Pt1@Gd2Ga4 and Pt2@Gd2Ga2In2 with larger edge lengths for the indium-substituted prism. Refinements of the occupancy parameters indicate the formation of small homogeneity ranges. The indium atoms are positioned at the edges of adjacent prisms and form zig-zag chains (330 pm In–In) extending along the y-axis. Temperature-dependent magnetic susceptibility data of GdPt2Ga3In show Curie–Weiss paramagnetism with an anomaly observed at T = 12.7(1) K, proven as intrinsic by zero-field heat capacity measurements, pointing towards a stable canted antiferromagnetic ground state.
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