Abstract
Sol-gel processing technique has been utilized to produce the gel of Pb-BSCCO system (Bi2-xPbxSr2Ca2Cu3O10 +/- y, where x = 0.2, 0.4, and 0.8, are the mole fraction of Pb substituted against Bi). The gel samples were subsequently heated to 800 degrees C for 2 h to obtain the powders which were then pressed and sintered at 845 degrees C for 60 h. The morphologies in the Pb-BSCCO gel, powder and sintered products were observed with scanning electron microscope (SEM) and optical microscope. The plate-like growths of the superconducting phases are evident from the SEM micrographs. The optical micrographs of sintered samples showed that the samples containing 0.2 and 0.8 mole fraction of Pb mainly consisted of dark grey and white regions, while sample having 0.4 thole fraction of Pb comprised of dark grey, light grey, and white regions. The different regions were analyzed by using energy dispersive X-rays (EDX) analyzer attached with SEM. The results revealed that the dark grey regions in all the samples represented the Bi2Sr2CaCu2O8 +/- y (2212) phase whereas, light grey regions in sample (x = 0.4) constituted the Bi2Sr2Ca2Cu3O10 +/- y (2223) phase. The white regions in all samples depicted the presence of CuO. The best result in term of larger fraction of superconducting phase (2223) has been observed in sample containing 0.4 mole fraction of Pb.