Structure and Properties of the Stannide Eu₂Au₂Sn₅, and its Relationship with the Family of BaAl₄-Related Structures

Abstract

-014Structure and Properties of the Stannide Eu 2 Au 2 Sn 5 , and Its Relationship with the Family of BaAl 4 -Related Structures.-The title compound Eu 2 Au 2 Sn 5 , prepared by arc melting of the elements, crystallizes in a new structure type, space group P2 1 /m, which can be considered as an ordered defect variant of the BaAl 4 type. The Au and Sn atoms form a complex three-dimensional [Au 2 Sn 5 ] substructure with short Au-Sn and Sn-Sn distances. The Eu atoms are embedded in this anionic substructure. Eu 2 Au 2 Sn 5 exhibits Curie-Weiss behavior above 50 K with an magnetic moment of 7.90 µ B per Eu atom indicating divalent europium. The compound shows metallic conduction with a specific resistivity of 150 µΩcm at room temperature. -

Structural chemistry of superconducting pnictides and pnictide oxides with layered structures

“…These authors reported the low-temperature structure in the triclinic space group P 1 1. This is astonishing, since LT-BaNi 2 As 2 would have the lowest symmetry of all BaAl 4 superstructures; see the Bär-nighausen tree in [86]. In most cases, the lowering of the symmetry proceeds via few, often only one step.…”

Lithium-Transition Metal-Tetrelides – Structure and Lithium Mobility

“…3). For an overview of the many BaAl 4 /ThCr 2 Si 2 related superstructures and ordering variants we refer to a review article [96].…”

Synthesis of Ce2Rh3Ge5 Crystals from a Bismuth Flux

“…The large cavity around the cerium atoms reminds of the structure of tetragonal CeRh 2 Ge 2 [16]. Both structures derive from the aristotype BaAl 4 [33]. In CeRh 2 Ge 2 , the cerium coordination is much more symmetric.…”