Abstract
The influence of SnO dopant on the superconductivity and the phase formation of the Bi(Pb)-Sr-Ca-Cu-O system has been studied using differential thermal analysis/thermogravimetric analysis, X-ray diffraction, a.c. susceptibility and resistance measurements. It was found that Sn2+ can be dissolved in the 110 K phase, but reduces the formation of this phase. Resistance measurements show 107 K zero resistance can be obtained for a short-time sintered sample (60 h), but that theT c(0) was found to decrease to 90 and 75 K after the specimens were sintered for 90 and 140 h, respectively. The a.c. susceptibility measurements show that no superconducting phase other than 110 K phase exists in the specimens sintered for longer times and the signal for the 110 K phase became weaker after the specimen had been sintered for 140 h, indicating a decrease in the volume fraction of this phase.
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Chen, Y.L., Stevens, R. The effect of tin dopant on the phase formation and superconductivity in Bi(Pb)-Sr-Ca-Cu-O. J Mater Sci: Mater Electron 1, 197–200 (1990). https://doi.org/10.1007/BF00696076
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DOI: https://doi.org/10.1007/BF00696076