Vitreous cylinders with compositions Bi 2-x Pb x Sr 2 CaCu 2 O y , (x = 0, 0.2, 0.4 and 0.6) were prepared and used as precursors to fabricate textured bars through a laser floating zone melting method (LFZ). The resulting textured cylindrical bars were annealed, followed by their electrical characterization. The microstructure was determined and correlated with the electrical measured properties. The influence of Pb doping on the sharpness of the superconducting to normal transition on the E-I curves has been determined. The sharpest transitions have been obtained for samples doped with 0.4Pb. Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB. Se han preparado precursores de tipo vítreo en forma de cilindro con composiciones nominales Bi 2-x Pb x Sr 2 CaCu 2 O y , con x = 0, 0.2, 0.4 y 0.6. Estos cilindros se han utilizado como precursores para fabricar barras texturadas por medio de una técnica de fusión zonal inducida por láser (LFZ). Estas barras texturadas se recocieron a diferentes temperaturas y se caracterizaron eléctricamente. Además, se examinó su microestructura para correlacionarla con las propiedades eléctricas medidas. La variación de la transición del estado superconductor al normal se ha relacionado con el dopaje con Pb a través de las curvas E-I. Las mejores transiciones se han obtenido para muestras dopadas con 0.4 Pb.. Palabras clave: Bi-2212, superconductividad, propiedades eléctricas, Pb.
Samples of Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O 10+d have been elaborated by use of three different methods. The first method uses a precursor obtained from CaCO 3 , SrCO 3 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 Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O 10+d phase. AC and DC Susceptibility measurements show the same critical temperature, T c , 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.
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