Resumen de Some effects of the doping α-Al_(2)O_(3) nanoparticles in the transport properties of Bi_(1.65)Pb_(0.35)Sr_(2)Ca_(2)Cu_(3)O_(y) ceramic superconductors

M. Hernández Wolpez, I. García Fornais, E. Govea-Alcaide, R.F. Jardim, P. Muné

• We present a preliminary study on the effects of nano-size α-Al_(2)O_(3) (40 nm) in the transport properties of Bi_(1.65)Pb_(0.35)Sr_(2)Ca_(2)Cu_(3)O_(y) ((Bi,Pb)-2223) ceramic samples. The (Bi,Pb)-2223 samples were synthesized by the solid state reaction method and α-Al_(2)O_(3) nanoparticles (NPs), with concentrations ranging from 0.1 to 0.7 wt. percent (% wt.), were added before the last heat treatment. All samples were characterized by means of X-rays diffraction patterns, and temperature and magnetic field dependence of the electrical resistivity, ρ(T, Ba). From the experimental ρ(T, Ba) data we extracted the critical temperature dependence of the % wt. of α-Al_(2)O_(3) NPs, and by using the Arrhenius plot the effective pinning energy has been also determined. The results indicate that mostly of the transport properties are optimized for the sample doped with 0.3% wt. of α-Al_(2)O_(3) NPs.