Fabrication of stable superconductive wires with YBa/sub 2/Cu/sub 3/O/sub x//Ag/sub 2/O composite core

Journal Article · Mon Feb 20 04:00:00 EST 1989 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.101475· OSTI ID:6443954

Sen, S; Chen, I; Chen, C H; Stefanescu, D M

The problem of maintaining the oxygen stoichiometry of the Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub x/ (the so-called 123) compound at the desired level of x = 6.0 +- 0.1 when fabricating superconducting wires using the powder-in-tube method is addressed. A solution to this problem appears to be incorporating an unstable oxide like Ag/sub 2/O in the core material, such that it acts as an in situ oxygen donor during the final sintering or annealing stage. Moreover, the segregation of Ag at the grain boundaries of the 123 grains and at the porosities seems to be a possible reason for the considerable improvement of the critical current density J/sub c/ of these wires. The effect of processing parameters, like different sintering temperatures and addition of various percentages of either Ag or Ag/sub 2/O, is presented. Finally, in order to test conservation of superconductive properties during handling, the wires were subjected to different degrees of bending, and the subsequent effect on superconducting transition temperature, T/sub c/ and J/sub c/, is reported.

• Research Organization: Department of Metallurgical and Materials Engineering, The University of Alabama, P.O. Box 870202, Tuscaloosa, Alabama 35487-0202
• OSTI ID: 6443954
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:8; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
IMPURITIES
INFORMATION
LOW TEMPERATURE
MATERIALS
METALS
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
POROSITY
RADIATION TRANSPORT
SEGREGATION
SILVER
SILVER COMPOUNDS
SILVER OXIDES
SINTERING
STABILITY
STOICHIOMETRY
SUPERCONDUCTING WIRES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
WIRES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES