Transient Eutectics in Sintering of Sodium Beta Alumina

  • Lutgard C. De Jonghe
  • Edward Goo
Part of the Materials Science Research book series (MSR, volume 11)


Sodium beta alumina solid electrolytes for use in the sodium/sulphur battery1 have been prepared by a wide variety of methods. Two different powders can be used: component oxides or other precursors to give a reactive sintering2–4, or prereacted powders5 with or without additives6. Fast heat-up rates and zone sintering2 seem now universally accepted as the preferred sintering schedule. Additional improvements in ionic conductivity and mechanical strength can be obtained by post-annealing treatments4. Generally, for prereacted ß alumina powders, such as the Alcoa powder XB-2 “superground”, heat-up rates are between 50–100°C min-1, and time- at-temperature (~1750–1800°C) is between 5 to 10 minutes. The high sintering temperatures are not an absolute necessity, as was recently demonstrated by Cannon and Chowdry6 who obtained 97% dense ß-alumina from the submicron agglomerate fraction of preconverted XB-2 powder sintered at 1530°C. Sintering times then get prohibitively long for commercial application, however. The high rates of densification during zone sintering led to the postulate that a transient liquid phase might be active during the densification of sodium beta alumina7. Additionally, preconverted beta alumina (Alcoa XB-2 “superground”) mixed with a small amount of metastable NaA1O2-ß alumina eutectic showed improved sinterability8,9 lending further support to the hypothesis that transient liquid phases are present at one point during the zone sintering process. In this paper we explore further if indeed a transient euteqtic liquid phase is responsible for the improved sinterability of preconverted sodium beta alumina powders when mixed with a small amount of metastable eutectic additive.


Transient Liquid Phase Electric Power Research Institute Thermal Impedance Local Shrinkage Zone Sinter 


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  1. 1.
    J. T. Kummer and N. Weber, Trans. Soc. Automotive Engrs, 76, 1003–1007 (1968).Google Scholar
  2. 2.
    Wynn Jones and L. J. Miles, Proc. Brit. Ceram. Soc. 19, 161–178 (1971).Google Scholar
  3. 3.
    K. Ray and E. C. Subbarao, Mat. Res. Bull. 10, 583–590 (1975).CrossRefGoogle Scholar
  4. 4.
    T. J. Whalen, G. J. Tennenhouse, and C. Meyer, J. Amer. Ceram. Soc. 57, 497–498 (1974).CrossRefGoogle Scholar
  5. 5.
    “Sodium-Sulphur Battery Development for Bulk Power Storage”, Interium Report, R. P. 128–2, Electric Power Research Institute, September 1975. Prepared by J. B. Bush, Jr., General Electric Company Research and Development Center.Google Scholar
  6. 6.
    R. M. Cannon and U. Chowdry, this Volume.Google Scholar
  7. 7.
    “Research on Electrodes and Electrolyte for the Ford Sodium Sulphur Battery”, RANN, NSF-C805 (AER-73–07199), January Prepared by S. Weiner, Ford Motor Company.Google Scholar
  8. 8.
    L. C. De. Jonghe and H. Chandan, Ceram. Bull. 55, 312–313, (1976).Google Scholar
  9. 9.
    L. C. De Jonghe and H. Chandan, U. S. Patent 3,959,022, May 25, 1976.Google Scholar
  10. 10.
    Y. LeCars, J. Théry and R. Collongues, Rev. Int. Hautes Tempér, et. Réfract. 9, 153–160 (1972).Google Scholar

Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • Lutgard C. De Jonghe
    • 1
  • Edward Goo
    • 1
  1. 1.Department of Materials Science and EngineeringCornell UniversityIthacaUSA

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