SrAu_4.76In_1.24 with YbMo₂Al₄-type structure

Ihor Muts (1, 2) , Samir F. Matar (3) , Ute Ch. Rodewald (1) , Vasyl' I. Zaremba (2) , Rainer Pöttgen (1)

1 Institut für Anorganische und Analytische Chemie
2 Department of Inorganic Chemistry [Lviv]
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The gold-rich intermetallic compound SrAu4.76In1.24 was synthesized by high-frequence-melting of the elements in a sealed tantalum tube and subsequent annealing. The structure was refined from single-crystal X-ray diffraction data: YbMo2Al4-type, I4/mmm, Z = 2, a = 718.77(7), c = 552.79(9) pm, wR2 = 0.0760, 149 F2 values and 11 parameters. The 4d (0.62 In + 0.38 Au) Wyckoff position shows mixed occupancy leading to the composition SrAu4.76In1.24 for the investigated crystal. The strontium atoms are located in a large cage built up by 12 Au + 8 In atoms. The gold and indium atoms show segregation into substructures. The striking structural motifs are Au4 squares (278 pm Au-Au) and indium chains (276 pm In-In)...

Mots clés: Strontium; Indium; Crystal Structure; Intermetallic compound

Domaines: Matériaux; Cristallographie; Chimie inorganique

Ihor Muts, Samir F. Matar, Ute Ch. Rodewald, Vasyl' I. Zaremba, Rainer Pöttgen. SrAu_4.76In_1.24 with YbMo₂Al₄-type structure. Zeitschrift fur Naturforschung B, 2011, 66 (10), pp.993-999. ⟨10.1515/znb-2011-1003⟩. ⟨hal-00636366⟩