A B C
Z. Naturforsch. 2014, 69b, 1053 – 1056
doi:10.5560/ZNB.2014-4146
La3Ir2 with Rhombohedral Er3Ni2-type Structure
Konrad Schäfer and Rainer Pöttgen
Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
Reprint requests to R. Pöttgen. E-mail: pottgen@uni-muenster.de
Received July 9, 2014 / published online October 12, 2014
La3Ir2 is formed upon reaction of the elements at 1273 K in a sealed silica ampoule. The structure was refined from single-crystal X-ray diffractometer data: Er3Ni2-type structure, R3̅, a = 895.26(2), c = 1713.01(5) pm, wR = 0.0578, 766 F2 values, 25 variables. The structure is composed of two simple basic building units: slightly distorted La1@La36La22 cubes resembling the tungsten structure and Ir2@La11La22La35 units with an AlB2-related coordination (298 pm Ir–Ir in the dumb-bell). Each cube is coordinated by six of the AlB2 units. The relationship with the U3Si2-type structure is discussed.
Key words: Lanthanum, Iridium, Crystal Structure, Intermetallics
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