Synthesis of bismuth-based high-Tc superconducting fibres by using sodium alginate as a polyelectrolyte |
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Authors: | A TAKADA T SHIMIZU |
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Affiliation: | (1) Department of Electrical Engineering, Hakodate 042, Japan;(2) Department of Material and Environmental Engineering, Hakodate National College of Technology, Hakodate 042, Japan |
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Abstract: | The thermal pyrolysis processes and solid-state reactions in the synthesis of bismuth-based high-Tc superconducting fibre obtained by using sodium alginates are studied. This alginate is a polyelectrolyte and has not only an excellent ion-exchange property but also a gelation to synthesize long fibrous precursors. We first determined the optimum conditions to promote ion-exchange of this polyelectrolyte which yields high contents of metal ions in the precursor. The thermal pyrolysis of a precursor was studied by DTA and IR absorption. On the basis of the DTA and XRD, the solid-state reactions associated with the formation of the 2 2 1 2 phase were revealed. Our method can be applied easily to synthesize Ag-sheathed fibre having an improved tensile strength. This revised version was published online in November 2006 with corrections to the Cover Date. |
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