• Oxide glass filaments and their superconducting phase by annealing

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      https://www.ias.ac.in/article/fulltext/boms/014/04/1093-1100

    • Keywords

       

      Glass-ceramic route; high temperature superconducting filaments; oxide glass filaments

    • Abstract

       

      Bi4Ca3Sr3CuxOy (4334) oxide glasses with different concentrations of the transition metal copper have been prepared by rapid quenching technique from respective melts. These glasses have been characterized from electrical, magnetic, dielectric and other properties. The semiconducting glasses are not superconducting even down to 4·2 K. However, by properly annealing the glasses in air or in oxygen atmosphere they can be converted into the corresponding superconducting phases with superconducting transition temperatures between 70 and 110 K depending on the Cu ion concentrations. The dc conductivity of the glasses could be explained with small polaron adiabatic hopping mechanism. Analysis shows that the correlated barrier hopping (CBH) mechanism is the most appropriate model for explaining the a.c. conductivities of these glasses. Addition of a small amount (about 2 wt%) of B2O3 makes it possible to draw glass filaments which could also be converted into the superconducting phase withTc values lower than those obtained from the respective pure glasses.

    • Author Affiliations

       

      B K Chaudhuri1 K K Som1

      1. High Temperature Superconductivity Laboratory, Indian Association for the Cultivation of Science, Calcutta - 700 032, India
    • Dates

       
  • Bulletin of Materials Science | News

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