Preparation and degradation behaviour of Bi-cuprate superconductors

Gogia, Balvinder ; Kashyap, Subhash C. ; Pandya, D. K. ; Chopra, K. L. (1991) Preparation and degradation behaviour of Bi-cuprate superconductors Bulletin of Materials Science, 14 (2). pp. 217-222. ISSN 0250-4707

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The role of preparation conditions and the effect of addition of Pb in Bi-Sr-Ca-Cu-O (BSCCO) superconductor, on theTc, Jc and grain orientation have been studied. Calcination at a temperature higher than the melting point of Bi2O3 after the prereaction at 800° C leads to formation of c-axis oriented nearly single phase material. The presence of lead yields a nearly high Tc phase (2223) exhibiting a maximum transition temperature Tc=110 K and Δ Tc=2 K. The addition of lead and grain orientation together result in an increase in Jc by nearly two orders of magnitude. The degradation behaviour was studied in terms of changes in Tc, Jc and structure on exposure to atmosphere up to 250 days. Samples with 0.6 Pb were found to be superconducting with Tc=97 K even after 250 days. The high Tc phase was stable against degradation. Our studies indicate that the degradation of leaded BSCCO is a surface phenomenon rather than bulk phenomenon.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:High Temperature Superconductors; Leaded BSCCO Superconductors; C-axis Orientation; Degradation Behaviour
ID Code:69135
Deposited On:08 Nov 2011 11:13
Last Modified:18 May 2016 15:39

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