Journal of Materials Science

, Volume 19, Issue 7, pp 2219–2222 | Cite as

Rapidly quenched sodium tungsten bronzes

  • Masahiro Tatsumisago
  • Tsutomu Minami
  • Masami Tanaka
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Abstract

Rapid quenching was applied to the sodium tungsten bronzes, Na x WO3, of differentx values. The crystallization processes of the coloured flakes obtained were analysed by differential thermal analysis and X-ray powder diffraction. It was found that an “amorphous bronze” phase is present in the quenched Na0.71WO3, whereas quenched Na0.84WO3 was composed of tungsten crystal and Na2O-WO3 glass. This difference is explained by the following equilibrium present in the melt of Na x WO3: 3xNa2WO4+(6−4x)WO3+xW⇄6Na x WO3 This equilibrium is shifted to the right whenx is small (x<0.7), while it is shifted to the left whenx is large (x>0.8).

Keywords

Sodium Polymer Crystallization Tungsten Thermal Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. 1.
    H. S. Chen andC. E. Miller,Rev. Sci. Instrum. 41 (1970) 1237.Google Scholar
  2. 2.
    A. M. Glass, M. E. Lines, K. Nassau andJ. W. Shiever,Appl. Phys. Lett. 31 (1977) 249.Google Scholar
  3. 3.
    N. Tsuya andK. Arai,Jpn. J. Appl. Phys. 18 (1979) 461.Google Scholar
  4. 4.
    B. W. Brown andE. Banks,J. Amer. Chem. Soc. 76 (1954) 963.Google Scholar
  5. 5.
    L. D. Ellerbeck, H. R. Shanks, P. H. Sidles andG. C. Danielson,J. Chem. Phys. 35 (1961) 298.Google Scholar
  6. 6.
    M. Tatsumisago, T. Minami andM. Tanaka,J. Amer. Ceram. Soc. 64 (1981) C-97.Google Scholar
  7. 7.
    M. Tatsumisago, I. Sakono, T. Minami andM. Tanaka,J. Mater. Sci. 17 (1982) 3593.Google Scholar
  8. 8.
    E. O. Brimm, J. C. Brantley, J. H. Lorenz andM. H. Jellinek,J. Amer. Chem. Soc. 73 (1951) 5427.Google Scholar
  9. 9.
    M. E. Straumanis,ibid. 71 (1949) 679.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1984

Authors and Affiliations

  • Masahiro Tatsumisago
    • 1
  • Tsutomu Minami
    • 1
  • Masami Tanaka
    • 1
  1. 1.Department of Applied ChemistryUniversity of Osaka PrefectureOsakaJapan

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