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Issue 4, 1997
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Comparison of the powder-in-tube processing properties of two(Bi2-xPbx)Sr2Ca2Cu3O10+δpowders

Abstract

The processing and formation kinetics in air of two commercial (Bi 2-x Pb x )Sr 2 Ca 2 Cu 3 O 10+ δ powders (Bi 1.87 Pb 0.34 Sr 1.89 Ca 1.94 Cu 3.00 O 10+ δ and Bi 1.84 Pb 0.33 Sr 1.84 Ca 2.07 Cu 3.06 O 10+ δ ) in a silver-sheathed tape using the powder-in-tube manufacturing technique have been investigated. The highest concentration of the (Bi 2-x Pb x )Sr 2 Ca 2 Cu 3 O 10+ 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 (Bi 2-x Pb x )Sr 2 Ca 2 Cu 3 O 10+ δ the 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 (Bi 2-x Pb x )Sr 2 Ca 2 Cu 3 O 10+ δ phase, then critical current densities in excess of 5×10 8 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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Article type: Paper
DOI: 10.1039/A606896K
Citation: J. Mater. Chem., 1997,7, 653-659
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    Comparison of the powder-in-tube processing properties of two (Bi2-xPbx)Sr2Ca2Cu 3O10+δpowders

    Timothy P. Beales, J. Jutson, L. Le Lay and M. Mölgg, J. Mater. Chem., 1997, 7, 653
    DOI: 10.1039/A606896K

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