Influence of silver and excess copper on the formation and properties of 2223 (Bi,Pb)--Sr--Ca--Cu--O superconductor

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1991.0455· OSTI ID:5886449

Tripathi, R B; Johnson, Jr, D W; Fleming, D A ^[1]

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1. AT T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (US)

The effect of silver additions and excess copper on the sinterability and weak link behavior has been studied in the nominal composition Bi{sub 1.72}Pb{sub 0.32}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (Ag=1--4 wt. %) and Bi{sub 1.72}Pb{sub 0.32}Sr{sub 2}Ca{sub 2}Cu{sub 3+{ital y}}O{sub {ital x}} where {ital y}=0.2--0.5, using magnetic susceptibility, XRD, and SEM methods. Ag additions enhance the weak link behavior, giving a magnetic susceptibility shoulder at 103 K. This shoulder became more prominent at high fields (35 Oe), and a low {ital T}{sub {ital c}} phase became evident with 4 wt. % Ag additions. In contrast to stoichiometric compositions, samples containing excess copper demonstated an enhancement of the sinterability and a large volume of 2223 phase even in calcined samples. XRD data and SEM analysis failed to detect any Cu-rich phase up to copper contents {ital y}=0.4. However, in copper samples with {ital y}=0.5, a small x-ray peak at 2{theta}=48.5{degree} has been observed corresponding to CuO.

• OSTI ID: 5886449
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 6:3; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRON MICROSCOPY
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SILVER ADDITIONS
SILVER ALLOYS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION