EuGaSb: a new Zintl phase with four-bonded gallium and three-bonded antimony in a complex three-dimensional [GaSb] polyanion.

Autor: Schellenberg, Inga, Eul, Matthias, Pöttgen, Rainer
Zdroj: Chemical Monthly / Monatshefte für Chemie; Sep2011, Vol. 142 Issue 9, p875-880, 6p
Abstrakt: The Zintl phase EuGaSb 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, and 32 variables. The structure consists of a three-dimensional polyanionic [GaSb] network with Ga dumb-bells (252.1(1) pm Ga1-Ga2) and antimonide anions, leading to the electron-precise description Eu[GaSb]. The divalent character of europium was evident from magnetic susceptibility data and Eu Mössbauer spectra. The crystal chemical relationship with the structures of EuGaAs and BaGaSb is discussed. Graphical abstract: [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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