A critical component of alkali metal thermal-to electric converter (AMTEC) devices for long duration space missions is the beta -alumina solid electrolyte ceramic (BASE), for which there exists no substitute. The temperature and environmental conditions under which BASE remains stable control operational parameters of AMTEC devices. We have used mass loss experiments in vacuum to 1573K to characterize the kinetics of BASE decomposition, and conductivity and exchange current measurements in sodium vapor filled exposure cells to 1223K to investigate changes in the BASE which affect its ionic conductivity. There is no clear evidence of direct thermal decomposition of BASE below 1273K, although limited soda loss may occur. Reactive metals such as Mn or Cr can react with BASE at temperatures at least as low as 1223K.


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    Titel :

    The thermal stability of sodium beta -Alumina solid electrolyte ceramic in AMTEC cells


    Beteiligte:
    Williams, Roger M. (Autor:in) / Ryan, Margaret A. (Autor:in) / Homer, Margie L. (Autor:in) / Lara, Liana (Autor:in) / Manatt, Ken (Autor:in) / Shields, Virgil (Autor:in) / Cortez, Roger H. (Autor:in) / Kulleck, James (Autor:in) / Bragg, Mary J. (Herausgeber:in) / El-Genk, Mohamed S. (Herausgeber:in)

    Kongress:

    Space technology and applications international forum -1999 ; 1999 ; Albuquerque, New Mexico (USA)


    Erschienen in:

    AIP Conference Proceedings ; 458 , 1 ; 1306-1311


    Erscheinungsdatum :

    22.01.1999


    Format / Umfang :

    6 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    The Thermal Stability of Sodium Beta"-Alumina Solid Electrolyte Ceramic in AMTEC Cells

    Williams, R. M. / Ryan, M. A. / Homer, M. L. et al. | British Library Conference Proceedings | 1999


    Thermal stability of beta -alumina solid electrolyte under AMTEC operating conditions

    Williams, Roger M. / Homer, Margie L. / Kulleck, James et al. | American Institute of Physics | 2000


    Thermal Stability of Beta"-Alumina Solid Electrolyte under AMTEC Operating Conditions

    Williams, R. M. / Homer, M. L. / Kulleck, J. et al. | British Library Conference Proceedings | 2000


    Performance of sodium - beta alumina solid electrolyte in Na/S cells

    Jonghe,L.C.de / Univ.of California,Lawrence Berkeley Lab.,US | Kraftfahrwesen | 1981


    Electrode, Current Collector, and Electrolyte Studies for AMTEC Cells

    Ryan, M. A. / Williams, R. M. / Underwood, M. L. et al. | British Library Conference Proceedings | 1993