The magnesium-rich intermetallics Ir3.30(1)Mg17.96(4)In0.74(4) and Ir3Mg17.1(1)In1.9(1) |
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Authors: | Viktor Hlukhyy |
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Institution: | Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 36, D-48149 Münster, Germany |
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Abstract: | Phase analytical investigations in the system magnesium-iridium-indium revealed the magnesium-rich intermetallics Ir3.30(1)Mg17.96(4)In0.74(4) and Ir3Mg17.1(1)In1.9(1). The samples were prepared from the elements via induction melting in glassy carbon crucibles in a water-cooled sample chamber and subsequent annealing. Both intermetallics were investigated by X-ray powder and single-crystal diffraction: C2/c, Z=4, a=979.1(1), b=2197.4(2), , β=105.79(1)°, wR2=0.0434, 3076 F2 values, 108 variables for Ir3.30(1)Mg17.96(4)In0.74(4), and a=983.39(8), b=2211.4(2), , β=105.757(6)°, wR2=0.0487, 3893 F2 values, and 115 variables for Ir3Mg17.1(1)In1.9(1). Both compounds show solid solutions. In Ir3.30(1)Mg17.96(4)In0.74(4), the indium site shows an occupancy by 69.9(4)% In+30.1(4)% Ir, and one magnesium site has a small mixed occupancy with indium, while nine atomic sites in Ir3Mg17.1(1)In1.9(1) show Mg/In mixing with indium occupancies between 1.2(3)% and 14.8(3)%. The relatively complex crystal structure is of a new type. It can be explained by a packing of coordination number 10 and 12 polyhedra around the iridium atoms. The crystal chemical peculiarities and chemical bonding in both intermetallics is briefly discussed. |
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Keywords: | Intermetallic compounds Crystal structure Indium |
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