Rare Earth-rich Cadmium Compounds RE₄TCd (T = Ni, Pd, Ir, Pt)

Abstract

New intermetallic compounds RE 4 T Cd (RE = Y, La-Nd, Sm, Gd-Tm, Lu; T = Ni, Pd, Ir, Pt) were synthesized by melting of the elements in sealed tantalum tubes in a highfrequency furnace. They crystallize with the Gd 4 RhIn-type structure, space group F43m, Z = 16. The four gadolinium compounds were characterized by single crystal X-ray diffractometer data: a = 1361.7 (1)

Substantial Cd–Cd Bonding in Ca6PtCd11: A Condensed Intermetallic Phase Built of Pentagonal Cd7and Rectangular Cd4/2Pt Pyramids

“…This is the first observation of Cd 7 PBP clusters as well as pronounced Cd aggregation with such short Cd–Cd bonds. Generally, less Cd in the form of separate Cd 4 tetrahedra occurs in Au- or Pt-richer intermetallics in which polar bonding with d-element components dominate, for example, in La 23 Pt 7 Cd 4 and Gd 4 PtCd (Cd–Cd: 3.17 Å and 3.19–3.25 Å, respectively). Also, tetrahedral star clusters, in which the faces of an inner Cd 4 tetrahedron are capped by Cd in a larger tetrahedron (Cd 4 @Cd 4 ), occur in the Cd-richer Na 6 Au 7 Cd 16 (d(Cd–Cd) = 3.08–3.30 Å), Ca 6 Pt 8 Cd 16 , and others, again with generally strong bonding in the presence of a greater fraction of d-elements.…”

Drastic Decrease of the Curie Temperature in the Solid Solution GdRuxCd1–x

“…Above 100 K we observed Curie-Weiss behavior ( Fig. 4a) with an experimental magnetic moment of 8.11 (1) µ B formula unit −1 and a Weiss con- stant of 70.4(1) K indicating ferromagnetic interactions. The experimentally determined magnetic moment is slightly larger than the free ion value of 7.94 µ B for Gd 3+ .…”

Rare Earth-rich Cadmium Compounds RE23T7Cd4 (T = Co, Ni, Ru, Rh, Ir, Pt)

“…These compounds crystallize with the hexagonal Pr 23 Ir 7 Mg 4 -type structure [5], space group P6 3 mc. Similar to the series of the isotypic magnesium compounds, for cadmium the Pr 23 Ir 7 Mg 4 -type compounds exist only for the larger rare earth elements, while the cubic Gd 4 RhIn type [2] is formed for the smaller ones [4]. For most of the six series, the unit cell volumes decrease with increasing ordering number of the rare earth element as expected from the lanthanoid contraction.…”

“…therein], where the In2 atoms build up dumb-bells (309 pm in Y 14 Ir 3 In 3 ) within the rare earth metal network. Even larger units have been observed in the cubic structure type Gd 4 RhIn [2] where the indium atoms form tetrahedra (317 pm) which are well separated within the rare earth metal matrix. Interestingly, the same structure type has been observed with the rare structural motif of Mg 4 and Cd 4 tetrahedra for several series of RE 4 T Mg and RE 4 T Cd compounds [3, 4, and refs.…”