Sinter conditions and superconducting properties of Bi-Pb-Sr-Ca-Cu-O superconductors

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Abstract
In high-Tc Bi(Pb)SrCaCuO pellets prepared by solid state reaction, a prolonged sintering increases the fraction of the 2223 high-Tc phase. In addition the upper critical field Bc2*, is enhanced due to an improved long-range order and stoichiometry. Nevertheless the critical current density becomes smaller in weak fields with sintering time because of the two-dimensional growth of the high-Tc phase, leading to a lower mechanical density. In the high-field region the magnetic field dependence of the critical current density, Jc, becomes less pronounced with reaction time as a result of the higher Bc2*. Thus, densification would improve Jc in all fields for long sintering periods.