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Effect of carbon impurities on Bi,Pb(2223) phase formation and critical current densities in silver-sheathed Bi,Pb(2223) tapes

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Published in Physica C: Superconductivity and Its Applications. 1995, vol. 255, no. 1-2, p. 53-60
Abstract An extensive study on the detrimental effects of C on the critical current density of silver-sheathed Bi,Pb(2223) tapes has been undertaken. Calcinations at 820°C in air, short-time low-energy milling and calcinations in CO2 free atmospheres are effective in diminishing the amount of C in Bi,Pb(2223)/Ag tapes. We have studied the effect of C by preparing two types of Bi,Pb(2223)/Ag tapes under identical conditions except for the calcination atmosphere (one in air and another in air and 0.5% vol. of CO2). For the C poor tapes (with 0.036 wt.% C), the amount of Bi(2212) in the calcined powder is higher, the reaction to Bi,Pb(2223) is faster, the critical current densities jc and their field dependence are better compared to the C rich tapes (with 0.056 wt.% C). The excess C is located preferentially at the grain boundaries and favors the formation of secondary phases. This is reflected by a steeper initial slope of jc(B) for the C rich tapes.
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JEREMIE, Andréa, GRASSO, Giovanni, FLUKIGER, René-Louis. Effect of carbon impurities on Bi,Pb(2223) phase formation and critical current densities in silver-sheathed Bi,Pb(2223) tapes. In: Physica C: Superconductivity and Its Applications, 1995, vol. 255, n° 1-2, p. 53-60. https://archive-ouverte.unige.ch/unige:98731

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