Resumo

HERNANDEZ-WOLPEZ, M. et al. Some effects of the doping α-Al₂O₃ nanoparticles in the transport properties of Bi_1.65Pb_0.35Sr₂Ca₂Cu₃O_y ceramic superconductors. Rev. mex. fis. [online]. 2018, vol.64, n.2, pp.127-131. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.64.127.

We present a preliminary study on the effects of nano-size α-Al2 O3 (40 nm) in the transport properties of Bi1.65 Pb0.35 Sr2 Ca2 Cu3 Oy ((Bi,Pb)-2223) ceramic samples. The (Bi,Pb)-2223 samples were synthesized by the solid state reaction method and α-Al2O3 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-Al2O3 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-Al2O3 NPs.

Palavras-chave : (Bi; Pb)-2223; transport properties; doping; effects of the material synthesis.

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