Effect of cooling rate on the transition temperature in Bi-Pb-Sr-Ca-Cu-O system
- Institute of Plasma Physics, Academia Sinica, Hefei (CN)
- Dept. of Physics, Univ. of Science and Technology of China, Hefei (CN)
The resistance and ac susceptibility measurements show that cooling rate of the cast-annealing samples in heat treatment process has some effect on the 110 K superconducting phase in Bi-Pb-Sr-Ca-Cu-O system. Rapid quenching of the sample in air from 845{degrees}C causes oxygen deficiency in lattice and brings about a trifling change of unit cell size along c-axis direction. The dc magnetization and specific heat anomaly {Delta}c measurements demonstrate that fast cooling rate can reduce the transition temperature of high T{sub c} phase and the lower critical field, and weaken the pinning forces for vertex lines. The peak value of specific heat anomaly of the sample with nominal composition of Bi{sub 1.7}Pb{sub 0.3}Sr{sub 2}Ca{sub 2}Cu{sub 4.5}O{sub Y} is till small in comparison with YBa{sub 2}Cu{sub 3}O{sub 7}. From the magnetization curve the authors can estimate that the superconducting volume fraction is about 20%.
- OSTI ID:
- 6430112
- Journal Information:
- Modern Physics Letters B; (USA), Vol. 4:4; ISSN 0217-9849
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
MAGNETIC SUSCEPTIBILITY
SUPERCONDUCTIVITY
PHASE TRANSFORMATIONS
CHEMICAL COMPOSITION
DISLOCATION PINNING
ELECTRIC IMPEDANCE
HIGH-TC SUPERCONDUCTORS
LATTICE PARAMETERS
OXYGEN
QUENCHING
TRANSITION TEMPERATURE
VACANCIES
YTTRIUM COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
IMPEDANCE
MAGNETIC PROPERTIES
NONMETALS
PHYSICAL PROPERTIES
POINT DEFECTS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
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