Abstract
Effects of B2O3, La2O3, and SnO2 additions on the formation and microsructure of the Bi‐2223 phase in the partial‐melting and sintering process has been studied by means of XRD, SEM, EDS, DTA, VSM, and AC susceptibility measurements. The bulk samples with compositions Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5BaOy (a=0, 0.02, 0.04, 0.06, 0.08, 0.1), Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5LabOy (b=0, 0.005, 0.01, 0.02, 0.04, 0.06) and Bi1.8(Pb1−cSnc)0.4Sr1.9Ca2.1Cu3.5Oy (c=0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by sintering at 825–850 °C for various times after partial‐melting at 875 °C for 1 hour. The sample with a=0.02 B2O3 addition shows the highest conversion of Bi‐2212 phase to the Bi‐2223 phase. B2O3 addition decreases the melting temperature of the Bi‐2212 phase. B2O3 overdoping (a>0.04) decreases the conversion of the Bi‐2212 phase to the Bi‐2223 phase due to increasing the amount of non‐superconducting secondary phases. La2O3 and SnO2 additions decrease the conversion of the Bi‐2212 phase to the Bi‐2223 phase. No new phases precipitated by B2O3, La2O3, and SnO2 additions have been observed in the range of our experiments.
Published Version
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