Intergrowth of hexagonal tungsten bronze and perovskite-like structures: The oxides ACu3M7O21 (A = K,Rb, Cs,TI; M = Nb,Ta) |
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Authors: | A Benmoussa D Groult F Studer B Raveau |
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Institution: | Laboratoire de Cristallographie, Chimie et Physique du Solide L.A. 251, I.S.M.R.A., Université de Caen, 14032 Caen Cedex, France |
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Abstract: | Seven oxides ACu3M7O21 have been isolated with A = K, Rb, Tl, Cs for M = Ta and A = K, Rb, Cs for M = Nb. These phases are orthorhombic: Å, Å, and Å, probable space group Cmmm. Their structure has been established from an X-ray diffraction study and from high-resolution microscopy observations. The structure consists of an intergrowth of single hexagonal tungsten bronze AM3O9 slices and double distorted perovskite Cu3M4O12 slabs (M = Nb, Ta) in which copper has a square coordination. The host lattice of these compounds can be considered as the member “n = 1; n′ = 2” of a series of intergrowths corresponding to the formulation |M3O9|Hn|M2O6|Pn′. |
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