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- W2098121043 abstract "Phosphate tungsten bronzes have been shown to be conductors of low dimensionality. A review of the crystallographic and structural properties of this huge series of compounds is given here, corresponding to the present knowledge of the different X-ray studies and electron microscopy investigations. Three main families are described, monophosphate tungsten bronzes, A x (PO 2 ) 4 (WO 3 ) 2 m , either with pentagonal tunnels (MPTBp) or with hexagonal tunnels (MPTBh), and diphosphate tungsten bronzes, A x (P 2 O 4 ) 2 (WO 3 ) 2 m , mainly with hexagonal tunnels (DPTBh). The general aspect of these crystal structures may be described as a building of polyhedra sharing oxygen corners made of regular stacking of WO 3 -type slabs with a thickness function of m , joined by slices of tetrahedral PO 4 phosphate or P 2 O 7 diphosphate groups. The relations of the different slabs with respect to the basic perovskite structure are mentioned. The structural description is focused on the tilt phenomenon of the WO 6 octahedra inside a slab of WO 3 -type. In this respect, a comparison with the different phases of the WO 3 crystal structures is established. The various modes of tilting and the different possible connections between two adjacent WO 3 -type slabs involve a great variety of structures with different symmetries, as well as the existence of numerous twins in MPTBp's. Several phase transitions, with the appearance of diffuse scattering and modulation phenomena, were analysed by X-ray scattering measurements and through the temperature dependence of various physical properties for the MPTBp's. The role of the W displacements within the WO 3 -type slabs, in two modulated structures ( m = 4 and m = 10), already solved, is discussed. Finally, the complexity of the structural aspects of DPTBh's is explained on the basis of the average structures which are the only ones solved." @default.
- W2098121043 created "2016-06-24" @default.
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- W2098121043 date "2001-09-29" @default.
- W2098121043 modified "2023-10-17" @default.
- W2098121043 title "Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors" @default.
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- W2098121043 doi "https://doi.org/10.1107/s0108768101009685" @default.
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