On the composition of 110 K superconductor in a (Bi,Pb)-Sr-Ca-Cu-O system

Journal Article · Tue Oct 15 04:00:00 EDT 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349119· OSTI ID:5237158

Bai, V S; Ravi, S ^[1]; Rajasekharan, T; Gopalan, R ^[2]

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1. School of Physics, University of Hyderabad, Hyderabad 500 134 (India)
2. Defense Metallurgical Research Laboratory, Hyderabad 500 258 (India)

The 110 K superconductor of the (Bi,Pb)-Sr-Ca-Cu-O system is prepared in single-phase form at the composition Bi{sub 1.6}Pb{sub 0.4}Sr{sub 2.01}Ca{sub 2.71}Cu{sub 3.93}O{sub {ital y}}. Disks of the material with favorable texture can be obtained in relatively short durations in an O{sub 2} poor atmosphere. The literature on the compositions of the 110 K superconductor is reviewed to reveal that the material can be synthesized in single-phase form in a range of compositions, which is poorer simultaneously in Bi and Sr with respect to the nominal composition (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital y}}, (2:2:2:3). At compositions close to 2:2:2:3, intermediate cold pressing steps between heat treatments are necessary to promote the formation of single-phase material. We find that at compositions which are considerably poorer in Bi and Sr with respect to 2:2:2:3, no such steps are necessary. In this paper, the microstructural reasons for this difference in behavior are also investigated.

• OSTI ID: 5237158
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COLD PRESSING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
FABRICATION
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
MATERIALS WORKING
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PRESSING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS