Transport and magnetization critical current densities in TlBa sub 2 Ca sub 2 Cu sub 3 O sub x tapes

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7038804

Willis, J O; Maley, M P; Kung, P J; Coulter, J Y; Peterson, D E; Wahlbeck, P G; Bingert, J F; Phillips, D S

The powder in tube process was used to produce silver-sheathed tapes of TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+x} (Tl-1223). The powder was produced by thalliating a precursor powder mixture to produce the Tl-2223 phase and then beating to drive off excess Tl and reach the Tl-1223 stoichiometry. The tapes were rolled and pressed, each step followed with a 3 h sintering. The 200 {mu}m thick tapes show little sign of texturing; however, the critical current shows a small ({approximately}50%) dependence on the direction of the applied magnetic field. Both transport and magnetization measurents indicate relatively strong pinning at high temperatures. The 75 K self field critical current density is 62 MA/m{sup 2}. Transport measurements reveal the presence of weak links at all temperatures, but with a relatively weak field dependence above {approx}0.1T.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7038804
• Report Number(s): LA-UR-92-3069; CONF-920802--17; ON: DE93000651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS