Abstract
New indides SrAu 3In 3 and EuAu 3In 3 were synthesized by induction melting of the elements in sealed tantalum tubes. Both indides were characterized by X-ray diffraction on powders and single crystals. They crystallize with a new orthorhombic structure type: Pmmn, Z=2, a=455.26(9), b=775.9(2), c=904.9(2) pm, wR2=0.0425, 485 F 2 values for SrAu 3In 3 and a=454.2(2), b=768.1(6), c=907.3(6) pm, wR2=0.0495, 551 F 2 values for EuAu 3In 3 with 26 variables for each refinement. The gold and indium atoms build up three-dimensional [Au 3In 3] polyanionic networks, which leave distorted hexagonal channels for the strontium and europium atoms. Within the networks one observes Au2 atoms without Au–Au contacts and gold zig-zag chains (279 pm Au1–Au1 in EuAu 3In 3). The Au–In and In–In distances in EuAu 3In 3 range from 270 to 290 and from 305 to 355 pm. The europium atoms within the distorted hexagonal channels have coordination number 14 (8 Au+6 In). EuAu 3In 3 shows Curie–Weiss behavior above 50 K with an experimental magnetic moment of 8.1(1) μB/Eu atom. 151Eu Mössbauer spectra show a single signal at δ=−11.31(1) mm/s, compatible with divalent europium. No magnetic ordering was detected down to 3 K.
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