Influence of sintering time and quenching in Bi2 −xPbxCa2Sr2Cu3Oy(x=0.0, 0.1, 0.2, 0.25, 0.3 and 0.4) samples have been studied by resistance and XRD measurements. In samples sintered at 850°C for 4 days,Tc(0) increases with Pb concentration.Tc(0) increased from 81 K forx=0.0 to 109 K inx=0.30 sample and then decreased. Increasing the sintering time to 10 days decreased theTc Quenching further decreased theTc(0). From X-ray diffraction patterns, the intensity peaks of low and highTc phases have been measured. The addition of Pb promotes highTc-phase. Sintering time, slow cooling and rapid quenching studies show that there is an optimum sintering time and cooling rate to produce a highTc-phase.
Volume 42 | Issue 6
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