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Synthesis of tungsten bronze powder and determination of its composition

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Abstract

Sodium tungsten bronze powders were synthesized by thermal reduction of a gas/melt system at high temperature. Samples having a cubic structure with different compositions were prepared. The initial melt included Na2WO4, WO3 and 10–40% mol. NaCl while the reducing gas was hydrogen at 750 °C. An original mechanism of controlling the powders size and distribution was suggested and discussed. A quantitative novel and simple method to determine the bronze composition based on TGA data was developed. An increase in the NaCl content led to a decrease of the crystals size and improved the powder uniformity. Fine powders, in the 2–5 μm size range, were synthesized from melt with 40% mol of NaCl. The stoichiometry parameter x of the obtained bronzes ranged from 0.8 to 0.92. An excellent agreement between x values determined by the classical XRD route and the proposed TGA method was demonstrated.

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Acknowledgements

The investigations were supported by the Technion’s fund for the promotion of research and in part by a joint grant from the Center for Adsorption in Science of the Ministry of Immigrant Absorption State of Israel and the Committee for Planning and Budgeting of the Council for Higher Education under the framework of the KAMEA Program.

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Authors and Affiliations

  1. Chemical Engineering Department, Technion, Haifa, 32000, Israel

    Meirav Mann, Gennady E. Shter & Gideon S. Grader

  2. Crown Center for Superconductivity and Physics Department, Technion, Haifa, 32000, Israel

    George M. Reisner

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  1. Meirav Mann
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  2. Gennady E. Shter
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  3. George M. Reisner
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  4. Gideon S. Grader
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Correspondence to Gideon S. Grader.

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Mann, M., Shter, G.E., Reisner, G.M. et al. Synthesis of tungsten bronze powder and determination of its composition. J Mater Sci 42, 1010–1018 (2007). https://doi.org/10.1007/s10853-006-1384-x

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  • DOI: https://doi.org/10.1007/s10853-006-1384-x

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