Abstract
The Zintl phase EuGa2Sb2 was synthesized by induction melting of the elements in a sealed tantalum tube. The structure was refined from X-ray single-crystal diffractometer data: new type, Pnma, a = 1834.7(3), b = 432.25(7), c = 674.8(1) pm, wR2 = 0.0377, 875 F 2, and 32 variables. The structure consists of a three-dimensional polyanionic [Ga2Sb2]2– network with Ga 4+2 dumb-bells (252.1(1) pm Ga1–Ga2) and antimonide anions, leading to the electron-precise description Eu2+[Ga2Sb2]2−. The divalent character of europium was evident from magnetic susceptibility data and 151Eu Mössbauer spectra. The crystal chemical relationship with the structures of EuGa2As2 and BaGa2Sb2 is discussed.
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This work was financially supported by the Deutsche Forschungsgemeinschaft through SPP 1458 Hochtemperatursupraleitung in Eisenpnictiden.
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Schellenberg, I., Eul, M. & Pöttgen, R. EuGa2Sb2: a new Zintl phase with four-bonded gallium and three-bonded antimony in a complex three-dimensional [Ga2Sb2] polyanion. Monatsh Chem 142, 875–880 (2011). https://doi.org/10.1007/s00706-011-0544-0
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DOI: https://doi.org/10.1007/s00706-011-0544-0