Impact of Ca(BO2)2 Doping on High-Tc Phase Formation and Transport Properties of Bi(Pb)-2223 Superconductor

Proper Doping of a high-temperature superconductor (HTS) Bi(Pb)-2223 is an effective route to prepare Bi(Pb)-2223 HTS with enhanced transport characteristics. In this paper, we studied the impact of Ca(BO 2 ) 2 doping on high-T c phase formation kinetics and transport critical current density of Bi(Pb)-2223. Samples with a nominal composition of Bi 1.7 Pb 0.3 Sr 2 Ca 2-x Cu 3 O y [Ca(BO 2 ) 2 ] x , x = 0 −0.15 were prepared by the solid-state reaction method. The phase evolution of the prepared materials was studied by X-ray diffraction analysis (XRD). The resistivity and critical current density were measured by the standard four-probe method. Scanning electron microscopy (SEM) combined with Energy Dispersive X-ray (EDX) microanalysis (SEM-EDX) was used to examine the microstructure and elemental composition of samples. The obtained results show that Ca(BO 2 ) 2 doping leads to the promotion of the high-T c phase formation and enhancement of the transport critical current density ( J c ) in Bi(Pb)-2223 HTS.