DOI: 10.1063/1.350858. Polymerized complex synthesis and intergranular coupling of Bi-Pb-Sr-Ca-Cu-O superconductors characterized by complex magnetic susceptibility

Polymerized complex synthesis and intergranular coupling of Bi-Pb-Sr-Ca-Cu-O superconductors characterized by complex magnetic susceptibility

10.1063/1.350858

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Superconducting Bi-Pb-Sr-Ca-Cu-O ceramics have been synthesized by the polymerized complex method at the Bi1.8Pb0.2Sr2Ca2Cu3Oy, Bi1.6Pb0.4Sr2Ca2Cu3Oy and Bi1.68Pb0.32Sr1.75Ca1.82Cu2.83Oy compositions. The polymerized complex method includes three important major steps: (1) formation of stable citrate complexes uniformly dispersed into ethyleneglycol and water, (2) fabrication of polymerized complexes which are formed through dehydration (or esterification) between ethyleneglycol and metal-citrate complexes, and (3) pyrolysis of the polymerized complex precursor and the subsequent heat treatments for producing the Bi-Pb-Sr-Ca-Cu-O superconductor. The present technique offers more convenient and easier fabrication of (Bi,Pb)2Sr2Ca2Cu3Oy superconductors compared with other more elaborate preparation procedures based on wet-chemical techniques, as it eliminates many steps such as ageing, filtration, washing, and pH control. ‘‘X-ray-clean’’ (Bi,Pb)-2223 superconductors have been obtained for all the three compositions after sintering at 850 °C in air for 94–235 h, depending upon the nominal composition of the starting batch. Noticeable is that a small deficiency of Sr, Ca, and Cu relative to the ideal stoichiometric composition of the (Bi,Pb)2Sr2Ca2Cu3Oy significantly accelerates the formation of the (Bi,Pb)-2223 phase. Complex magnetic susceptibility measurements show that Tc(onset) of the bulk (Bi,Pb)-2223 phase remains almost constant at around 108 K, independent of the compositions. However, it is stressed that low-level and/or amorphous impurity phases possibly concentrated on grain boundaries can have dramatic effects on the overall magnetic properties even for materials which look like very ‘‘clean’’ by x-ray diffraction. The best superconducting properties were obtained with samples with a nominal composition of Bi1.6Pb0.4Sr2Ca2Cu3Oy after sintering in air at 850 °C for 180–280 h. The onset temperature of superconducting transition obtained by complex susceptibility was 108.0 K and the transition width (10%–90%) of full diamagnetism was 5.2 K for a measuring field of 100 mOe.

Bibliography

Kakihana, M., Yoshimura, M., Mazaki, H., Yasuoka, H., & BÃ¶rjesson, L. (1992). Polymerized complex synthesis and intergranular coupling of Bi-Pb-Sr-Ca-Cu-O superconductors characterized by complex magnetic susceptibility. Journal of Applied Physics, 71(8), 3904â3910.

Authors 5

Masato Kakihana (first)
Masahiro Yoshimura (additional)
Hiromasa Mazaki (additional)
Hiroshi Yasuoka (additional)
Lars Börjesson (additional)

References 20 Referenced 83

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:15 a.m.)
Deposited	1 year, 6 months ago (Feb. 4, 2024, 10:15 a.m.)
Indexed	2 months, 1 week ago (June 16, 2025, 8:07 a.m.)
Issued	33 years, 4 months ago (April 15, 1992)
Published	33 years, 4 months ago (April 15, 1992)
Published Print	33 years, 4 months ago (April 15, 1992)

Funders 0

None

BibTeX

@article{Kakihana_1992, title={Polymerized complex synthesis and intergranular coupling of Bi-Pb-Sr-Ca-Cu-O superconductors characterized by complex magnetic susceptibility}, volume={71}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.350858}, DOI={10.1063/1.350858}, number={8}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Kakihana, Masato and Yoshimura, Masahiro and Mazaki, Hiromasa and Yasuoka, Hiroshi and Börjesson, Lars}, year={1992}, month=apr, pages={3904–3910} }

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