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The quaternary gallium-rich intermetallic phases  RE  2 Pt 3 Ga 4 In 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  2 Pt 3 Ga 4 In phases crystallize with a site ordering variant of the orthorhombic Y 2 Rh 3 Sn 5  type, space group  Cmc  2 1 . The structures of Gd 2 Pt 3 Ga 4 In, Dy 2 Pt 3 Ga 4.14 In 0.86 , Er 2 Pt 3 Ga 4.17 In 0.83  and Tm 2 Pt 3 Ga 4.21 In 0.79  were refined from single-crystal X-ray diffraction data. The single crystals reveal small homogeneity ranges  RE  2 Pt 3 Ga 4±x In 1±x . The striking geometrical structural building units are slightly distorted trigonal prisms around the three crystallographically independent platinum atoms: Pt1@ RE  4 Ga 2 , Pt2@ RE  2 Ga 4  and Pt3@ RE  2 Ga 2 In 2 . Based on these prismatic building units, the  RE  2 Pt 3 Ga 4 In structures can be described as intergrowth variants of TiNiSi and NdRh 2 Sn 4  related structural slabs. Temperature dependent magnetic susceptibility studies of Gd 2 Pt 3 Ga 4 In and Tb 2 Pt 3 Ga 4 In show Curie-Weiss behavior and the experimental magnetic moments confirm stable trivalent gadolinium respectively terbium. Gd 2 Pt 3 Ga 4 In and Tb 2 Pt 3 Ga 4 In order antiferromagnetically at  T  N  = 15.8(1) and 26.0(1) K. Magnetization curves at 3 K show field-induced spin reorientations.

Quaternary intermetallics RE 2 Pt 3 Ga 4 In ( RE =Y, Gd-Tm) – intergrowth structures of NdRh 2 Sn 4 and TiNiSi related slabs