Abstract
The reactivities of several oxide materials (OM) in direct contactwith BSCCO powder has been tested at a temperature of approximately845 °C in air. The OM such as BaZrO3, SrCO3, MgO and ZrO2showing little or no reactivity with BSCCO were mixed (10 wt%) with a BSCCOprecursor powder and used for monocore tapes made by a standard powder-in-tubetechnique. The microstructure of the BSCCO+OM cores was analysed by SEM andXRD and the transport current properties - critical current, pinning force andresistance up to 16 T - were measured as a function of the magnetic field forvarious orientations with respect to the ab plane. The OM used influencedthe electrical properties of the Bi-2223 phase in different ways. This isbecause the oxides react with BSCCO during the heat treatment andsimultaneously affect the 2212→2223 phase transformation as well as theBi-2223 grain growth and grain connectivity. Submicrometre commercial SrCO3powder was evaluated as the best material from all those tested, for resistivebarriers in Bi-2223/Ag tapes.
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