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DOI: 10.1039/A606896K (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 653-659

Comparison of the powder-in-tube processing properties of two (Bi2-xPbx)Sr2Ca2Cu 3O10+δpowders

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Timothy P. Beales, Jo Jutson, Luc Le Lay and Michelé Mölgg

Abstract

The processing and formation kinetics in air of two commercial (Bi2-xPbx)Sr2 Ca2Cu3O10+δ powders (Bi1.87Pb0.34Sr1.89Ca 1.94Cu3.00O10+δand Bi1.84Pb0.33Sr1.84Ca2.07Cu 3.06O10+δ) in a silver-sheathed tape using the powder-in-tube manufacturing technique have been investigated. The highest concentration of the (Bi2-xPbx)Sr2 Ca2Cu3O10+δ phase was found to occur at the ceramic/silver interface. The results over a range of times and processing temperatures were fitted to an Avrami equation. In the process range that yielded the optimum volume fraction of (Bi2-xPbx)Sr2 Ca2Cu3O10+δthe Avrami exponent was found to bem=1.2, indicative of platelike growth. In this same region the critical current densities were found to be the maximum and showed that if the entire ceramic cross-section can be processed to have a high volume fraction of the (Bi2-xPbx)Sr2 Ca2Cu3O10+δ phase, then critical current densities in excess of 5×108 A m-2 should be routinely achieved. The difference in physical properties of the two powders was attributed to the different starting morphologies of the powders, which determined the properties of the final product.

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