Preparation of high-density YBa sub 2 Cu sub 3 O sub x ceramics with improved superconducting properties by hot pressing under controlled atmosphere

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346941· OSTI ID:6227929

Kuwabara, M; Shimooka, H ^[1]

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1. Kyushu Institute of Technology, Tobata, Kitakyushu, Japan (JP)

High-density YBa{sub 2}Cu{sub 3}O{sub {ital x}} (relative sintered density {ge}97%, as hot pressed) ceramics with an improved superconducting temperature ({ital T}{sub {ital c}}) of 95 K and a critical current density ({ital J}{sub {ital c}}) of 700 A/cm{sup 2} at 77 K, 0 T have successfully been produced by using hot pressing under a carefully controlled ambient gas system, followed by an appropriate oxygenation process. The obtained results indicate that in the oxygenation process of an YBa{sub 2}Cu{sub 3}O{sub {ital x}} crystal the phase transition from the tetragonal phase (nonsuperconducting) to orthorhombic I phase ({ital T}{sub {ital c}}{ge}90 K) occurs much easier than from orthorhombic II phase ({ital T}{sub {ital c}}{approx}60 K) to orthorhombic I phase. This may also demonstrate a possible solution to the oxygenation problem in high-density YBa{sub 2}Cu{sub 3}O{sub {ital x}} ceramics usually with degraded superconducting properties.

• OSTI ID: 6227929
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:11; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CURRENTS
ELECTRIC CURRENTS
FABRICATION
HOT PRESSING
MATERIALS WORKING
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSING
SYNTHESIS
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES