Process optimization for the Pb- and Sb-substituted Bi-based 2:2:2:3 bulk ceramic superconductors

Abstract

The synthesis and superconducting properties of Pb-and Sb-substituted Bi-2 : 2 : 2 : 3 materials have been investigated. The preparation conditions for t h e formation of the pure 2 : 2 : 2 : 3 phase have been optimized. Actual Sb-substitution into the Bi-system 2 : 2: 2 : 3 phase was successful as indicated by t h e XRO study. The transport measurements revealed no significant enhancement of t h e critical temperature such as was reported previously for the Sb-substituted phase. However, an enhanced melt-sintering orientation effect was observed in samples containing unreacted Sb,O,

The Effect of Zn Substitution of Ca in BiPbSrCaCuO Superconductors Sintered at 830 °C

“…Several substitution studies have been done to obtain desired properties in Bi(2223). It was previously reported that partial substitution of Bi, Ca, and Cu commonly by Sn, Sb, Ag, Hg and Pb has increased T c and Ca 2 CuO 3 has improved J c -B characteristics in Bi(2223) superconductors [1][2][3][4][5][6]. Especially Pb substitution forms a liquid phase which aids in the 2223 phase formation.…”

Influence of boron-containing dopants on the formation of superconducting phase in the system Bi(Pb)-Sr-Ca-Cu-O

“…The properties of antimony as a dopant are also uncertain. It was reported in [7] that doping of the Bi-Sr-Ca-Cu-O system by antimony leads to significant increase in T c (up to 160 K), but this result was not confirmed by other authors [8].…”