preparation of 110K (Bi, Pb)-Sr-Ca-Cu-O superconductor from glass precursor
The Bi1.5Pb0.5Sr2Ca2Cu3O(x) glass, prepared by rapid quenching of the melt, showed T(sub g) of 383 C, crystallization temperature of approx. 446 C, melting temperature of approx. 855 C, and bulk density of 5.69 g/cu. cm. in air. The as-quenched glass was oxygen deficient. On heating in O2, it showed a slow, irreversible, and continuous weight gain starting at approx. 530 C. The influence of annealing conditions on the formation of various phases was investigated by XRD and electrical resistivity measurements. The 110K-T(sub c) phase did not form below 840 C. The amount of this phase increased with the sintering time at 840 C. A sample annealed at 840 C for 243 h in air and furnace cooled showed the highest T(sub c)(R=0) of 107.2K and transition width delta T(sub c)(10 to 90 percent) of approx. 2 K.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (USA)
- OSTI ID:
- 7008074
- Report Number(s):
- N-90-14108; NASA-CR--185162; E--5131; NAS--1.26:185162; CONF-891020--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Superconducting Bi sub 1. 5 Pb sub 0. 5 Sr sub 2 Ca sub 2 Cu sub 3 O sub x ceramics by rapid melt quenching and glass crystallization
Glass-derived superconducting ceramics with zero resistance at 107 K in the Bi sub 1. 5 Pb sub 0. 5 Sr sub 2 Ca sub 2 Cu sub 3 O sub x system
Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALLIZATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GLASS
HEAT TREATMENTS
LEAD COMPOUNDS
LEAD OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUENCHING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE