Thermal decomposition of precursor and the formation of superconducting phases in the Pb-Bi-Sr-Ca-Cu-O(Pb- BSCCO) System. | [Journal of Chemical Society of Pakistan • 2003]

Author(s):

1. A. H. Qureshi: NMD, PINSTECH P.O. Nilore, Islamabad, Pakistan

2. S. K. Durrani: NMD, PINSTECH P.O. Nilore, Islamabad, Pakistan

3. M. Arshad: Applied Physics Division (APD), PINSTECH, P.O. Nilore, Islamabad, Pakistan

4. F. R. Sale: Manchester Materials Science Centre, University of Manchester/UMIST, Manchester, England

5. N. Arshad: Deparment of Chemistry, Allama lqbal Open University, Islamanad, Pakistan

6. S. U. Rehman: Department of Chemistry, University of Peshawar, NWFP, Pakistan

Abstract:

Superconducting phases in the Pb-BSCCO system have been produced by ethylenediaminetetraacetic acid (EDTA)-gel processing using nitrate solutions. The decomposition of EDTA-gel precursor has been studied by thermo-analytical techniques in conjunction with X-ray diffraction (XRD) method. The thermo-analytical data are discussed in relation to the sequence of phase formation necessary for the production of superconducting phases. The effect of Pb is shown to lower the temperature of formation of the Bi2Sr2Ca2Cu3OY (2223) high Tc phase. The Bi2Sr2Ca, Cu20Y (2212) low Tc phase was observed as a main product at 800°C along with the Bi2Sr2Cu2OY (2201) phase and Ca2PbO4.`Sintering at higher temperature (845°C) led to the formation of the high Tc phase (2223). It is shown that liquid phase sintering of the samples assisted the formation of the 2223 phase. There is an optimum level of Pb addition above which the 2223 phase is not produced even when heated for up to 60 hours at 845°C.

Page(s): 177-182

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 25, Issue: 3, Year: 2003

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