Rapid formation of the high-T
c phase in (Bi,Pb)-Sr-Ca-Cu-O superconductor via the sol-gel method |
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| Authors: | S R Sheen D H Chen C T Chang C H Kao J C Huang Y C Chou Y C Hsieh Y H Hsieh M K Wu H S W Chang |
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| Affiliation: | (1) Department of Chemistry, National Tsing Hua University, 30043 Hsinchu, Taiwan;(2) Department of Materials Science Center, National Tsing Hua University, 30043 Hsinchu, Taiwan;(3) Department of Chemistry, Soochow University, Taipei, Taiwan;(4) Materials Science Centre, National Tsing Hua University, 30043 Hsinchu, Taiwan |
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| Abstract: | Bi-Pb-Sr-Ca-Cu-O powder was synthesized by the oxalate gel method. A sample with the composition of Bi1.7Pb0.4Sr1.6Ca2.4Cu3.6Oy was used in this study. After pyrolysis of the gel precursor at 500 °C for 5 h, the resulting powder was calcined at 850 °C for another 5 h. The black powder was pressed into pellets and sintered at 852 °C for 5 h. The high-T
c phase was formed more easily in the sample with excess calcium and copper than in the theoretical composition. (Bi,Pb)2Sr2Ca2Cu3Oy (above 90%) was prepared as above within a relatively short time. Characterization of (Bi,Pb)2Sr2Ca2Cu3Oy superconductor by X-ray diffraction, scanning electron microscopy, electron probe microanalysis, resistivity measurement and magnetic measurement, is reported. |
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