Formation of (Bi,Pb)-2223 Phase during Solidifying and Sintering
High-temperature microstructures and the formation of (Bi,Pb)-2223 phase were examined in Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06Ox during solidifying and sintering by high temperature optical microscope, XRD, SEM, EDS and AC susceptibility measurement. During solidification, firstly, the needle-like phase (SrxCa1-x) 2CuO3 began to crystallize at about 930 °C, secondly, the (SrxCa1-x) CuO2 with rectangular shape began to crystallize around 890 °C, and finally the plate-like 2212 phase began to form by the peritectic reaction of the two (Sr.Ca)-Cu-O compounds and liquid phase below 870 °C. The 2223 phase and Sr6Pb2O9 were transformed slowly by the solid state reaction of the 2212 phase and residual (Sr,Ca)-Cu-O compounds in a long time sitering (> 18 h) at 840 °C after solidification.
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