Bronzes with a tunnel structure KxP4O8(WO3)2m: The tenth member of the series—KP8W40O136 |
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Authors: | Ph Labbé D Ouachée M Goreaud B Raveau |
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Institution: | Laboratoire de Cristallographie, Chimie, et Physique du Solide, L.A. 251, Université de Caen, 14032 Caen Cedex, France |
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Abstract: | The crystal structure of KP8W40O136, the tenth member of the series KxP4O8(WO3)2m, has been resolved by three-dimensional single-crystal X-ray analysis. The space group is and the cell parameters are a = 19.589(3) Å, b = 7.5362(4) Å, c = 16.970(3) Å and β = 91.864(14)°. The framework is built up from ReO3-type slabs connected through pyrophosphate groups. The structure is compared to those of the other members of the series: although the ReO3-type slabs show a different type of tilting of the WO6 octahedra, the dispersion of WO distances is always higher for the octahedra linked to one or two P2O7 groups and decreases in proportion as W is farther from these groups. The perovskite cages of the slabs are described and compared to those encountered in the structures of WO3 and of the bronzes AxWO3. |
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