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2005
Structure
D 2000
02- 008
Mg2+xIr3-x (x = 0.30) — A Binary Variant of the Monoclinic V2(Co0.57Si0.43)3 Type.
— The title compound is synthesized by reacting the elements under reduced Ar pressure in a Ta crucible at 1500 K followed by slow cooling. As revealed by powder and
single crystal XRD, Mg2.3Ir2.7 crystallizes in the monoclinic space group C2/m with
Z = 10 (V2(Co0.57Si0.43)3-type structure). Similar to the silicide structure, Mg2.3Ir2.7 also
contains mixed occupied (Mg/Ir) sites. The Mg/Ir and Mg atoms form a three-dimensional network of empty condensed tetrahedra in which the Ir atoms fill distorted pentagonal channels. Both fully occupied Ir sites have a distorted icosahedral coordination
by Mg/Ir and Mg. — (HLUKHYY, V.; POETTGEN*, R.; Solid State Sci. 6 (2004) 10,
1175-1180; Inst. Anorg. Anal. Chem., Westfael. Wilhelms-Univ., D-48149 Muenster,
Germany; Eng.) — W. Pewestorf
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