Abstract
We investigated the microstructure and flux pinning capability of the bulk(Bi,Pb)2Sr2Ca2Cu3Oy system (denoted as (Bi, Pb)-2223) with 0.0–0.3 wt% nano-sizeZrO2 particles (10–20 nm) addition synthesized by solid state reaction. Phase analysis byx-ray diffraction (XRD), granular structure examination by scanning electronmicroscopy (SEM), microstructure investigation by transmission electronmicroscopy (TEM) equipped with energy dispersive x-ray spectrometer(EDS), critical current density dependence on the applied magnetic fieldJc(H) and electricalresistivity ρ(T,H) were carried out. The results show that activation energies of vortex flux motionU(H), criticalcurrent density Jc(H) behavior in applied magnetic field and volume pinning force densityFp are enhanced by theaddition of 0.1 wt% ZrO2. The pinning force analysis and microstructure observations indicated that theimprovement of flux pinning is suggested to originate from the introduction of extrinsicpinning centers due to the formation of normal nano-sized Zr-rich phase.
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