Abstract
Influence of boron-doping on the superconducting properties of (Bi,Pb)-2223 HTS ceramics prepared in an alumina crucibles has been investigated. X-ray diffraction, resistivity, and AC susceptibility measurements were performed on the undoped and boron-doped compounds. Obtained results have shown that B2O3 addition in the Bi1.7Pb0.3Ca2Sr2Cu3Oy precursor enhances the formation of high-Tc phase. The boron-doped samples with starting composition Bi1.7Pb0.3Ca2Sr2Cu3BxOy (x=0.05 and 0.5) reveal significant improvement in the zero resistivity temperature compared to the undoped sample (from 72 K up to 100 K). Boron-doping level x=1.5 results in a substantial degradation of the (Bi,Pb)-2223 phase.
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