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Preparation and Characterization of YBa2Cu4O8 Superconductor

Conference ·
OSTI ID:5964979
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States)
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Solid-state reaction of appropriate amounts of Y2O3, BaCOs, and CuO for 2 h at 800°C in flowing oxygen with a total pressure of 2.7 x 102 Pa (2 mm Hg), followed by cooling and annealing at 750°C for 10 h in oxygen at ambient pressure, has produced orthorhombic YBa2Cu4O8 (124) as the main phase with YBa2Cu3Ox (123) as an impurity phase. After the as-calcined powder was annealed in oxygen at 800°C for 24 h under ambient pressure, the phase purity improved considerably. Calcined 124 powder was pressed into pellets and rapidly annealed at temperatures from 870°C to 935°C. At these temperatures, the 124 decomposed into 123. The superconducting transition temperature, Tc, of the annealed samples depended upon the annealing temperature and atmosphere. The decomposed samples have been characterized by low field RF SQUID magnetometer and high resolution transmission electron microscopy.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
5964979
Report Number(s):
ANL/CP--70570; CONF-901125--13; ON: DE91010596; CNN: CONRACT DMR88-09854
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
ELECTRON MICROSCOPY
ELEMENTS
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
MAGNETIZATION
MICROSCOPY
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS
SUPERCONDUCTORS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES