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The Hexagonal Laves Phase MgIr2
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Viktor Hlukhyy
Published/Copyright:
June 2, 2014
Abstract
The hexagonal Laves phase MgIr2 was synthesized from the elements in a sealed tantalum tube in an induction furnace. MgIr2 was investigated by powder and single crystal X-ray data: P63/mmc, a = 516.9(1), c = 838.5(2) pm, wR2 = 0.0771, 135 F2 values, and 11 variable parameters. The magnesium atoms have coordination number (CN) 16 (12 Ir + 4 Mg), while the smaller iridium atoms, Ir1 and Ir2, both have CN 12 (6 Ir + 6 Mg). The Ir-Ir distances within the three-dimensional network of face- and corner-sharing Ir4/2 tetrahedra range from 250 to 267 pm. The magnesium atoms have one shorter (306 pm) and three longer (319 pm) magnesium contacts. The crystal chemistry of MgIr2 is briefly discussed and compared with the other binary Mg-Ir intermetallics.
Published Online: 2014-6-2
Published in Print: 2004-8-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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