A FORMATION MECHANISM OF BI-2223 BY MIXING INTERMEDIATE COMPOUNDS IN THE BI(PB)-SR-CA-CU-O SYSTEM

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The formation and growth behaviour of the Bi-2223 phase was investigated by sintering a mixture of Bi0.82Cu0.18Ox, Sr2CuO3, Ca2CuO3, CuO and PbO at 850 degrees C. The mixture was partially melted at 770 degrees C because of the eutectic liquid from Bi0.82Cu0.18Ox. The liquid phase was unable to directly synthesize the Bi-2223 phase from the mixture. instead, it enhanced the formation of the Bi-2212 phase with large grains. Then the Bi-2223 phase seemed to form both at the grain boundaries and on the free surfaces of the Bi-2212 phase and grew along the ab planes of the Bi-2223 phase with the dissolution of the Bi-2212 phase, resulting in larger Bi-2223 platelets than those in the conventional process which requires the calcination of a mixture of Bi2O3, SrCO3, CaCO3, CuO and PbO. This new mixture also enhanced the transformation rate from the Bi-2212 phase to the Bi-2223 phase. Our results indicated that the formation of the Bi-2212 and Bi-2223 phases was a consecutive reaction and larger Bi-2223 platelets could be prepared by sintering at 850 degrees C with a mixture of intermediate compounds in the Bi(Pb)-Sr-Ca-Cu-O system.
Publisher
IOP PUBLISHING LTD
Issue Date
1995-07
Language
English
Article Type
Article
Keywords

CA-CU-O; HIGH-TC PHASE; 2223 PHASE; BI; SUPERCONDUCTOR; TEMPERATURE; CERAMICS; GROWTH

Citation

SUPERCONDUCTOR SCIENCE TECHNOLOGY, v.8, no.7, pp.552 - 557

ISSN
0953-2048
URI
http://hdl.handle.net/10203/75525
Appears in Collection
MS-Journal Papers(저널논문)
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