Magnetic properties of superconducting ceramics Bi1.6Pb0.4Sr2Ca2Cu3O10+d prepared by different methods

Samples of Bi2-xPbxSr2Ca2Cu3O10+d have been elaborated by use of three different methods. The first method uses a precursor obtained from CaCO3, SrCO3 and CuO. In the second method the CuO is not used to obtain the precursor while the third method is without precursor. At each step of the elaboration, the samples are analyzed by means of X-ray powder diffraction. Final samples are characterized by Scanning Electron Microscopy. The three methods allows to obtain a pure Bi2-xPbxSr2Ca2Cu3O10+d phase. AC and DC Susceptibility measurements show the same critical temperature, Tc, but different dependance temperature when the constant applied field is changed. Differences are also observed in magnetization measurements at 5 and 80 K. The results are correlated with the different granular structures obtained by the three methods. (copyright 2004 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)