Direct conversion of superconducting Y sub 2 Ba sub 4 Cu sub 7 O sub 15 minus. delta. from YBa sub 2 Cu sub 3 O sub 7 minus x at atmospheric pressure in an O sub 2 ambient

Journal Article · Mon Nov 12 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104157· OSTI ID:6290639

Liang, J M; Chen, L J ^[1]

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1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan (People's Republic of China)

Direct conversion of superconducting Y{sub 2}Ba{sub 4}Cu{sub 7}O{sub 15{minus}{delta}} (Y-247) from YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (Y-123) was achieved at atmospheric pressure. The Y-247 samples were synthesized by the reactions of Y-123 and Cu-(NO{sub 3}){sub 2} at 860 {degree}C in an O{sub 2} ambient. The results strongly suggest that Y-247 is a thermodynamically more stable phase than Y-123 at the atmospheric pressure. The conversion also provides a novel and simple route to synthesize the Y-247 compound.

• OSTI ID: 6290639
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:20; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
KINETICS
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REACTION KINETICS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES