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In this work we investigate the effect of each different heat treatment stagein the fabrication of Bi2Sr2CaCu2O8+d superconducting wires on intra-grain andinter-grain superconducting properties. We measure magnetic criticaltemperature Tc values and transport critical current density Jc at temperaturesfrom 4 K to 40 K and in fields up to 7 T. From an analysis of the temperaturedependence of the self-field critical current density Jc(T) that takes intoaccount weak link behavior and proximity effect, we study the grain boundaries(GB) transparency to supercurrents and we establish a relationship between GBoxygenation in the different steps of the fabrication process and the GBtransparency to supercurrents. We find that grain boundary oxygenation startsin the first crystallization stage, but it becomes complete in the plateau at836 {\deg}C and in slow cooling stages, and is further enhanced in theprolonged post annealing step. Such oxygenation makes GBs more conducting, thusimproving the inter-grain Jc value and temperature dependence. On the otherhand, from the inspection of the Tc values in the framework of the phasediagram dome, we find that grains are oxygenated already in the crystallizationstep up to the optimal doping, while successive slow cooling and post annealingtreatments further enhance the degree of overdoping, especially if carried outin oxygen atmosphere rather than in air.

Investigation of inter-grain critical current density in Bi2Sr2CaCu2O8+d superconducting wires and its relationship with the heat treatment protocol