Development of high Tc (greater than 110K) Bi, Tl and Y-based materials as superconducting circuit elements. Semiannual Report, Feb. - Oct. 1991

Technical Report · Fri Nov 01 00:00:00 EST 1991

OSTI ID:5832725

Haertling, G; Grabert, G; Gilmour, P

Experimental work was continued on the development and characterization of bulk and hot pressed powders and tapecast materials in the Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems. A process for producing warp-free, sintered, superconducting tapes of Bi composition Bi1Sr2Ca2 Cu3O(x) was established. The procedure requires a triple calcination at 830 C for 24 hours and sintering at 845 C from 20 to 200 hours. Hot pressing the triple calcined powder at 845 C for 6 hours at 5000 psi yielded a dense material, which on further heat treatment at 845 C for 24 hours, exhibited a Tc of 108.2K. The Bi compositions were found to be much less oxygen sensitive than the Y compositions. This was especially noted in the case of the hot pressed materials which were superconducting as hot pressed, a condition that could not be achieved in the Y compositions. Safire-type grounding links are in the process of being fabricated from these materials.

• Research Organization: Clemson Univ., SC (United States)
• OSTI ID: 5832725
• Report Number(s): N-92-11902; NASA-CR-188999; NAS-1.26:188999; CNN: NAG1-1108
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CHEMICAL PREPARATION
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
FABRICATION
STRONTIUM OXIDES
THALLIUM OXIDES
EXPERIMENTAL DATA
HEAT TREATMENTS
HOT PRESSING
POWDERS
SINTERING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DATA
INFORMATION
MATERIALS WORKING
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PRESSING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
SYNTHESIS
THALLIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)