|
Z. Naturforsch. 2012,
67b, 1221 – 1224
doi:10.5560/ZNB.2012-0224
MgCuAl2-type Intermetallics REPdCd2(RE = Ce, Pr, Nd, Sm)
Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
Reprint requests to R. Pöttgen. E-mail:
pottgen@uni-muenster.de
Received August 22, 2012 / published online November 12, 2012
The cadmium-rich intermetallic compounds REPdCd2 (RE = Ce, Pr, Nd, Sm) were obtained by high-frequency melting of the elements in sealed niobium ampoules and subsequent annealing in muffle furnaces. The REPdCd2 phases crystallize with the orthorhombic MgCuAl2-type structure, space group Cmcm. The structure of NdPdCd2 was refined from single-crystal X-ray diffractometer data: a = 421.9(3), b = 995.4(7), c = 834.5(6) pm, wR = 0.0286, 451 structure factors, 16 variables. The palladium and cadmium atoms build up a three-dimensional [PdCd2] network (281–283 pm Pd–Cd; 298–335 pm Cd–Cd) in which
the neodymium atoms fill cavities. They are connected to the [PdCd2] network via shorter Nd–Pd bonds of 286 pm.
Key words: Cadmium, Intermetallics, Crystal Chemistry