Abstract
New intermetallic cadmium compounds RE2Rh2Cd (RE= La, Ce, Pr, Nd, Sm) were synthesized from the elements in sealed tantalum tubes in a high-frequency furnace. They were characterized through X-ray powder data: Mo2FeB2 type, space group P4/mbm, Z = 2. Single crystal data of the cerium compound (a = 762.8(1), c = 377.8(1) pm, wR2 = 0.0662, 199 F2 values, and 13 variable parameters) revealed small defects on the rhodium position leading to the composition Ce2Rh186(3)Cd for the investigated crystal. According to the course of the cell volumes Ce2Rh2Cd may be classified as a mixedvalent compound. The Ce2Rh2Cd structure is an intergrowth of slightly distorted AlB2 and CsCl related slabs of compositions CeRh2 and CeCd. Within the CeRh2 slab short Ce-Rh contacts (284-300 pm) are indicative of strong Ce-Rh bonding. The Rh-Rh distance within the AlB2 related slab is 289 pm.
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