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- W1649380400 abstract "A high- T c superconductor with a nominal composition of Bi 0.7 Pb 0.3 Sr 1.0 Ca 1.0 Cu 1.8 O y was prepared by the citrate method. The solid precursor produced by the dehydration of the gel at 120°C for 12 h is not in the amorphous state as expected, but in a crystalline state. X-ray diffraction (XRD) peaks of nearly the same angular position as the peaks of high- T c phase were observed in the precursor. After pyrolysis at 400°C and calcination at 840°C for 4 h, the (002) peak of the high- T c phase was clearly observed. However, the volume fraction of the high- T c phase did not increase significantly with sintering time. The zero-resistance temperature, T c (0), was found to be 90.8, 95.6, and 98.3 K after sintering at 845°C for 10, 20, and 80 h, respectively. Experimental results suggest that the intermediate phase formed before the formation of the superconducting phases may be the most important factor in determining whether it is easy to form the high- T c phase or not, because the nucleation barriers of the two superconducting phases may be altered by the variation of the crystal structures of those intermediate phases." @default.
- W1649380400 created "2016-06-24" @default.
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- W1649380400 date "1990-04-01" @default.
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- W1649380400 title "Preparation of Bi<sub>0.7</sub>Pb<sub>0.3</sub>Sr<sub>1.0</sub>Ca<sub>1.0</sub>Cu<sub>1.8</sub>O<sub>y</sub> High-T<sub>c</sub> Superconductor by the Citrate Method" @default.
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- W1649380400 doi "https://doi.org/10.1143/jjap.29.652" @default.
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