Synthesis and characterization of new Rh(III) compounds with the K4CdCl6 structure-type: Sr3MRhO6 (M = Y, Sc, In)

摘要

The compounds Sr3MRhO6 (M = Y,Sc,In) have been synthesised and structurally characterized by Rietveld refinement of powder X-ray diffraction data in the space group R (3) over bar c; Z=6. The lattice parameters for the series were found to be a = 9.7598(1)Angstrom and c = 11.3152(1) Angstrom, a = 9.6833(1) Angstrom and 11.0478(2) Angstrom, and a=9.6473(1)Angstrom and c=11.3597(1)Angstrom, for Sr3YRhO6, Sr3ScRhO6, and Sr3InRhO6, respectively. Thermogravimetric analysis indicates that these phases are stoichiometric rhodium(III) oxides. The oxygen content was determined to be 6.00(2), 6.05(2), and 5.99(2), for Sr3MRhO6 (M= Y,Sc,In), respectively. These compounds are isostructural with K4CdCl6. The structure consists of infinite one-dimensional chains of alternating face-shared RhO6 octahedra and MO6, trigonal prisms (M = Y, Sc, In). The strontium cations are located in a distorted square antiprismatic environment. (C) 1998 Academic Press. [References: 20]