SrAu4.76In1.24 with YbMo2Al4-type structure
Résumé
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)...
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