• B K Chaudhuri

      Articles written in Bulletin of Materials Science

    • Oxide glass filaments and their superconducting phase by annealing

      B K Chaudhuri K K Som

      More Details Abstract Fulltext PDF

      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.

    • Some aspects of glass-ceramic superconductors

      B K Chaudhuri

      More Details Abstract Fulltext PDF

      In this review article we have discussed, in brief, the general procedure for making glass-ceramic superconductors and some of their physical properties. All these glasses which become superconductors after properly annealing at higher temperatures are, in general, transition metal oxides (TMO) with copper ions. So the usual theoretical models of polaronic hopping conduction mechanisms are valid for explaining the semiconducting behaviour of these oxide glasses. Some of the transport properties of the glass-ceramic (GC) phases, viscosity of the glassy state, wire making feasibility etc have also been discussed in short.

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