• K Shahi

      Articles written in Bulletin of Materials Science

    • Preparation and characterization of glassy and superconducting (Bi, Pb, Sb)-Sr-Ca-Cu-O systems

      V P N Padmanaban K Shahi

      More Details Abstract Fulltext PDF

      Superconducting compounds with nominal compositions Bi1.7Pb0.3Sr1.6Ca2 Cu3.4Ox and Bi1.9Sb0.1Sr2Ca2Cu3Oy have been synthesized by ceramic and glass routes and characterized by X-ray diffraction, electrical resistivity and dielectric constant measurements. The zero-electrical resistance temperatures are about 70K. The dielectric constant of the glasses at room temperature is around 30.

    • Heterogeneous doping effects in KCl-Al2O3 composites

      Ashok Kumar K Shahi

      More Details Abstract Fulltext PDF

      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.

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