| Abstract
| - Single crystals of two new barium rhodates were grown from a molten potassium carbonateflux. The new rhodates, Ba11Rh10O30 and Ba32Rh29O87, are structurally related to the 2H-hexagonal perovskitestructure and are characterized by pseudo one-dimensional chains of alternating face-sharing trigonal prismsand octahedra. The structures of Ba11Rh10O30 and Ba32Rh29O87 were solved using the 4D superspace groupapproach in Jana2000. Ba11Rh10O30, with a repeat of nine RhO6 octahedra followed by one RhO6 trigonalprism, contains the longest chain sequence of face-sharing octahedra known for this 2H-perovskite relatedfamily of oxides. A structural analysis of these two compounds revealed clear trends in metal−metaldistances and octahedral heights not previously identified for this family of oxides. The application of thesetrends toward the structure of the all-octahedra-containing end member of the structural series, thehypothetical 2H−BaRhO3, enabled a prediction of its rhodium−rhodium distance, octahedral height, andlattice parameters.
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