Abstract
High-Tc superconductor Bi2Sr2CaCu2Oy was prepared by melt-casting process (MCP). The MCP was achieved by raising the temperature of the furnace up to 1000°C. The MCP samples are subjected to a heating procedure at 840°C in order to reach the two-CuO layer phase. The oxygen concentration, that results from the final annealing condition, was optimized in order to obtain the highest value of the critical temperature Tc. Measurements of electrical resistance as a function of temperature for MCP samples have shown sharp drops associated with the onset of intragranular superconductivity. The enhancement of superconducting properties is due to the addition of strontium sulfate (SrSO4). The value of Tc increases for SrSO4 addition up to approximately 10wt%. The zero resistance is observed at 90.4K for the 10wt% SrSO4 added sample annealed at 800°C in air.
