Complex three-dimensional platinum–indium networks in the ternary indides Dy2Pt7In16 and Tb6Pt12In23

Synthesis and crystal structures of Nd6Pt13In22, Sm6Pt12.30In22.70, and Gd6Pt12.48In22.52

“…No impurity elements heavier than sodium have been observed. The experimentally determined compositions of 1472 at% Nd:3372 at% Pt:5372 at% In for Nd 6 …”

“…Starting materials for the preparation of Nd 6 In the first step the larger rare earth ingots were cut into smaller pieces under paraffin oil. They were subsequently washed with n-hexane and kept under argon atmosphere prior to use.…”

“…In the RE-Pt-In systems, the indium-rich compounds REPtIn 3 (RE ¼ La, Ce, Pr, Nd, Sm) [3], RE 3 Pt 4 In 12 (RE ¼ Gd, Tb) [4], RE 3 Pt 4 In 13 (RE ¼ La, Ce) [5], Dy 2 Pt 7 In 16 and Tb 6 Pt 12 In 23 [6], LaPtIn 4 and YbPtIn 4 [3,7], and RE 4 Pt 10 In 21 (RE ¼ La, Ce, Pr, Nd) [8] have been synthesized via the indium-flux technique or through special annealing procedures. All these compounds have complex crystal structures, where the platinum and indium atoms build up three-dimensional polyanionic networks.…”

“…The shortest Pt-Pt distances observed are in Gd 3 Pt 4 In 12 (338 pm) [4] and Tb 6 Pt 12 In 23 (320 pm) [6], however, these Pt-Pt distances are considerably longer than the Pt-Pt distance of 277 pm in fcc platinum [9]. Further phase analytical investigations in the RE-Pt-In systems revealed a peculiar crystal chemical situation for the Tb 6 Pt 12 In 23 structure type. The 2c In3 site can also be occupied by platinum (leading to a Pt 3 cluster unit) or one observes Pt/In mixing.…”

Crystal structure and physical properties of the new intermetallics REPt4In4 (RE = Gd – Lu, Y)

“…Fragmentary investigations into the ternary phase diagrams REePteIn have yielded the following phases and structure types: RE 6 Pt 12 In 23 (RE ¼ Nd, Sm, Gd) [1,2], REPtIn (RE ¼ EueTm, Lu) [3e5], R 12 Pt 7 In (R ¼ Ce, Pr, Nd, Gd, Ho) [6], YbPtIn 4 [7], Dy 2 Pt 7 In 16 [2], Gd(Tb) 3 Pt 4 In 12 [8], GdPt 2 In [9], RE 5 Pt 2 In 4 (RE ¼ Sc, Y, LaeNd, Sm, GdeTm, Lu) [10]. Herein, we report on the new series of the late rare-earth indides REPt 4 In 4 (RE ¼ Gd e Lu, Y), which crystallize with a new structure type.…”