Journal of Materials Science

, Volume 42, Issue 3, pp 1010–1018

Synthesis of tungsten bronze powder and determination of its composition

  • Meirav Mann
  • Gennady E. Shter
  • George M. Reisner
  • Gideon S. Grader
Article

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.

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Meirav Mann
    • 1
  • Gennady E. Shter
    • 1
  • George M. Reisner
    • 2
  • Gideon S. Grader
    • 1
  1. 1.Chemical Engineering DepartmentTechnionHaifaIsrael
  2. 2.Crown Center for Superconductivity and Physics DepartmentTechnionHaifaIsrael

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