• Heterogeneous doping effects in KCl-Al2O3 composites

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    • Keywords


      Composite solid electrolytes; space charge layer; random resistor network percolation model

    • Abstract


      The composite solid electrolyte systems KCl-Al2O3 have been synthesized by conventional as well as by solution casting methods and have been characterized by means of complex impedance analysis, XRD and DTA techniques. The samples prepared by solution casting method show about an order of magnitude higher conductivity than those prepared by the conventional method. The enhanced conductivity is attributed to the excess cation vacancies generated in the space charge region of the matrix phase surrounding the Al2O3 particles as a consequence of stabilization of cations at the dispersoid surface due to internal adsorption. The XRD and DTA analyses show that no new phase is present. Macroscopically, the compositional and particle size dependence of the conductivity are adequately explained on the basis of random resistor network percolation model.

    • Author Affiliations


      Ashok Kumar1 K Shahi1

      1. Materials Science Programme, Indian Institute of Technology, Kanpur - 208 016, India
    • Dates

  • Bulletin of Materials Science | News

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