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The ternary rare earth transition metal-indides  RE  3  T  2 In 4  ( RE =Dy–Tm;  T =Pd, Ir) were obtained from high-temperature reactions in sealed niobium ampoules. These indides adopt a hexagonal structure of the Lu 3 Co 1.87 In 4  type (space group  P 6̅), a ternary ordered superstructure of the aristotype Fe 2 P. The structures of three different compounds were refined from single-crystal X-ray diffractometer data:  a =768.20(6),  c =381.97(3) pm, 1441  F  2  values, 24 parameters,  wR 2=0.0338 (Ho 3 Pd 1.90 In 4 );  a =774.98(3),  c =378.51(2) pm, 577  F  2  values, 23 parameters,  wR 2=0.0742 (Ho 3 Ir 1.69 In 4.31 ) and  a =780.3(1),  c =369.4(1) pm, 573  F  2  values, 22 parameters,  wR 2=0.0403 (Tm 3 Ir 1.51 In 4.49 ). Refinements of the occupancies revealed homogeneity ranges in case of the iridium-based crystals resulting from Ir/In mixing. The refined composition of the palladium compound was Ho 3 Pd 1.90 In 4  resulting from defects on the Wyckoff position 1 d , which was already reported for the prototype Lu 3 Co 1.87 In 4 . The geometrical motifs of the  RE  3  T  2 In 4  structures are three different types of tricapped trigonal prisms around the transition metal and indium atoms which are condensed via common edges and triangular faces. Temperature dependent magnetic susceptibility measurements of Dy 3 Ir 2 In 4  and Tm 3 Ir 2 In 4  showed Curie-Weiss behavior and the experimental magnetic moments of 10.59(2) μ B  (Dy 3 Ir 2 In 4 ) and 7.40(2) μ B  (Tm 3 Ir 2 In 4 ) confirming stable trivalent  RE  3+  states. Dy 3 Ir 2 In 4  and Tm 3 Ir 2 In 4  order antiferromagnetically with Néel temperatures of  T  N =13.6(5) and 5.4(5) K, respectively.

Ternary indides RE 3 T 2 In 4 ( RE =Dy–Tm; T =Pd, Ir)