A pentagonal tunnel structure with copper in square planar coordination: The oxides KCuNb3O9 and KCuTa3O9 |
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Authors: | D. Groult M. Hervieu B. Raveau |
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Affiliation: | Laboratoire de Cristallographie, Chimie et Physique des Solides, L.A. 251, ISMRA-Université, 14032 Caen Cedex, France |
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Abstract: | The structure of two new oxides KCuTa3O9 and KCuNb3O9 has been solved from X-ray powder data and by electron microscopy. Both compounds are orthorhombic, space group Pnc2 with Å, Å, and Å. Their host lattice is built up from corner-sharing MO6 octahedra (M = Nb, Ta) forming pentagonal tunnels where the K+ ions are located. The copper ions are located in distorted perovskite CaCu3Mn4O12-type cages and exhibit a square planar coordination. The relationships between these oxides and the TTB, HTB, ITB, and Ba0.15WO3 structures are discussed. |
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