Transport and magnetic properties of Bi(Pb)2212 superconducting ceramics doped by low rate of potassium

Samples of Bi1.5Pb0.5(Sr1.8-xKx)CaCu2O8+d and Bi1.5Pb0.5Sr1.8CaCu2O8+dKx have been prepared from powders of carbonates and primary oxides using the solid state reaction method and compared in this study. In the first case, potassium (K) is substituted in the strontium (Sr) site. In the second one, K is added. A part of the paper is devoted to discuss the results obtained by X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) observations of (Bi,Pb)(2)Sr1.8CaCu2O8+d samples doped by potassium to provide additional microstructural information related to the doping method. These analyses are supplemented by resistivity and magnetic measurements. Results show how the rate of doping by potassium affects transport and magnetic properties of Bi(Pb)2212 phase. The critical current density (J(c)) is improved using the two methods and it reaches a double value by the addition of K as compared to the undoped sample.

Automated summary

Samples of Bi1.5Pb0.5(Sr1.8-xKx)CaCu2O8+d and Bi1.5Pb0.5Sr1.8CaCu2O8+dKx were prepared using the solid state reaction method and compared. The study discussed the effects of potassium doping on the microstructure and transport properties of the materials, showing that the addition of K can improve the critical current density of the Bi(Pb)2212 phase.