Effect of Bi and Sr concentrations on the formation of the 2223 phase in Bi-Pb-Sb-Sr-Ca-Cu-O materials, obtained under different conditions of thermal treatment |
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Authors: | K. Konstantinov N. Balchev G. Gyurov I. Stambolova I. Khristova |
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Affiliation: | (1) Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1040 Sofia, Bulgaria;(2) Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria;(3) Higher Institute of Chemical Technology, 8 Kl. Ohzidski Blvd., 1156 Sofia, Bulgaria |
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Abstract: | The superconducting properties and the phase and chemical composition of BixPb0.3Sb0.1SryCa2Cu3Oz (x=1.5, 1.6, and 1.7;y=1.9, 2.0, and 2.1) materials synthesized by one-step and multistep thermal treatments have been investigated. The multistep annealing between 825–875°C promotes the 2223 phase. The change of Bi concentration has little effect on the 2223 phase formation, regardless of the kind of thermal treatment used, but increasing the Sr concentration (y> 2) strongly inhibits this phase. It has also been established that the loss of Pb after synthesis depends on the initial Bi concentration. The loss of Pb decreases when the initial Bi content is lower. |
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Keywords: | Bi-Pb-Sb-Sr-Ca-Cu-O Bi and Sr concentrations annealing effect 2223 phase |
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