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- W2078672736 abstract "The electrical resistivity of the tungsten oxide, W18O49, is 1.75 · 10−3 Ω cm along the needle axis. The charge carrier density, as determined by reflectivity measurements, is 1.87 · 1022 cm−3, thereby indicating that most of the charge carriers are delocalized. Hence the smaller conductivity along the needle axis than that expected for such charge carrier concentrations must be found in the structure, which has been refined using the data collected with an automatic diffractometer. The structure consists of WO6 and WO7 polyhedra which are linked along edges and/or corners. However, as the linkage parallel to b takes place only by sharing corners, an anisotropy in the electrical conductivity may be expected. Another explanation for the smaller conductivity may be found in the occurrence of defects such as tunnels in the structure, which may scatter the electrons. The refinement shows that the tungsten positions, determined by Magneli (Arkiv Kemi 1, 223 (1950)), are essentially correct; but the positions of the oxygens, especially two of them, differ considerably. This results in one of the tungsten atoms getting an additional coordinating oxygen, the coordination number thereby becoming seven." @default.
- W2078672736 created "2016-06-24" @default.
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- W2078672736 date "1981-01-01" @default.
- W2078672736 modified "2023-10-12" @default.
- W2078672736 title "Crystal structure and charge carrier concentration of W18O49" @default.
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- W2078672736 doi "https://doi.org/10.1016/0022-4596(81)90190-0" @default.
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