The h-SbxWO3+2x Oxygen Excess Antimony Tungsten Bronze |
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Authors: | Dr Fabian O von?Rohr Alice Ryser Dr Huiwen Ji Dr Karoline Stolze Dr Jing Tao Jessica J Frick Prof Greta R Patzke Prof Robert J Cava |
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Institution: | 1. Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland;2. Department of Chemistry, Princeton University, Princeton, New Jersey, 08544 USA;3. Condensed Matter Physics Department, Brookhaven National Laboratory, Upton, New York, 11973 USA |
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Abstract: | We describe the previously unreported oxygen excess hexagonal antimony tungsten bronze with composition Sb0.5W3O10, in the following denoted as h-SbxWO3+2x with x=0.167, to demonstrate its analogy to classical AxWO3 tungsten bronzes. This compound forms in a relatively narrow temperature range between 580 °C<T<620 °C. It was obtained as a dark-blue polycrystalline powder, and as thin, needle-shaped, blue single crystals. h-SbxWO3+2x crystallizes in the hexagonal space group P6/mmm with the cell parameters a=7.4369(4) Å and c=3.7800(2) Å. The antimony and excess oxygen occupy the hexagonal channels within the network of corner-sharing WO6 octahedra. h-SbxWO3+2x has a resistivity of ρ300 K≈1.28 mΩ cm at room temperature, with little if any temperature-dependence on cooling. DFT calculations on a simplified model for this compound find a metallic-like electronic structure with the Fermi level falling within rather flat bands, especially around the Γ point. |
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Keywords: | antimony bronze hexagonal bipyramids metallic oxide tungsten |
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