Impurities and defects of high- J sub c YBa sub 2 Cu sub 3 O sub x superconductor with flux jumps

Journal Article · Sun Dec 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349746· OSTI ID:6190396

Wang, L P; Chen, K; Lin, C L; Chu, J J ^[1]

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1. Materials Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan 310 (R.O.C.)

The microstructures of a highly textured bulk YBa{sub 2}Cu{sub 3} (123) superconductor, with the high-transport {ital J}{sub {ital c}} ({ge} (R18)3.7{times}10{sup 4} A/cm{sup 2} at 77 K) and flux jumps ({ital T}{lt}15 K), were characterized by x-ray diffraction, polarized optical microscopy, scanning electron microscopy, and scanning transmission electron microscopy. It was found that the grains of the 123 superconductor are preferentially oriented along the {ital a}-{ital b} plane of the 123 phase. The Y{sub 2}BaCuO{sub 5} and CuO particles are dispersed uniformly in the 123 matrix, and the highly dense twins run through the matrix everywhere. Some irregular-shaped BaCuO{sub 2}-CuO mixtures were observed at the 123 grain boundaries. The aligned 123 crystals and microstructural defects in the 123 matrix are considered to be responsible for the high-{ital J}{sub {ital c}} value and flux jumps.

• OSTI ID: 6190396
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:12; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
IMPURITIES
MAGNETIC FLUX
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES