Crystal Growth and Structure Determination of Novel Barium Rhodates: Stepping Stones Towards 2H-BaRhO₃

Author(s)

Katherine E. Stitzer, University of South Carolina - Columbia
Ahmed El Abed, Institut de Chimie de la Matière Condensée de BordeauxFollow
Jacques Darriet, Institut de Chimie de la Matière Condensée de Bordeaux
Hans Conrad zur Loye, University of South Carolina - ColumbiaFollow

Document Type

Article

Subject Area(s)

Chemistry

Abstract

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

Publication Info

Published in Journal of the American Chemical Society, Volume 126, Issue 3, 2004, pages 856-864.

Rights

Copyright © 2004 American Chemical Society

DOI: 10.1021/ja0374271

Publisher's Version: http://dx.doi.org/10.1021/ja0374271