Crystal Structure, ⁷Li NMR, and Structural Relationship of Two Rare‐Earth Metal Richer Polar Intermetallics: La₁₅Ge₉Li_1.50(16) and La₇Ge₃

Abstract

Small single crystals of La15Ge9Li1.50 (I) and La7Ge3 (II) are obtained by solid state reaction of a 15:9:2 (7:3) molar mixture of the elements (Nb ampoule in evacuated silica tubes, 1080 °C, 5 h).

Overlooked Binary Compounds Uncovered in the Reinspection of the La–Au System: Synthesis, Crystal Structures, and Electronic Properties of La7Au3, La3Au2, and La3Au4

“…Among the gold-containing phases, the Th 7 Fe 3 type is adopted by M 7 Au 3 with M = Sr, Eu, and Yb, − i.e., the metals that have a tendency to adopt the +II oxidation state. Rare earth metals (RE) that prefer the +III oxidation state form compounds with the Th 7 Fe 3 structure when combined with transition elements of groups 8–10. − In addition, binary compounds Sc 7 P 3 and La 7 Ge 3 , containing main-group elements, were reported to crystallize in this type. , From these examples, it is clear that the existence field of the Th 7 Fe 3 structure extends over a wide region of valence electron counts. However, it is not clear at the moment if other RE 7 Au 3 compounds exist and whether any of them are thermodynamically stable.…”

“…54−66 In addition, binary compounds Sc 7 P 3 and La 7 Ge 3 , containing main-group elements, were reported to crystallize in this type. 67,68 From these examples, it is clear that the existence field of the Th 7 Fe 3 structure extends over a wide region of valence electron counts. However, it is not clear at the moment if other RE 7 Au 3 compounds exist and whether any of them are thermodynamically stable.…”