Grain alignment in bulk YBa[sub 2]Cu[sub 3]O[sub [ital x]] superconductor by a low temperature phase transformation method
- Metals and Ceramics Division, Oak Ridge National Laboratory, Oak, Ridge, Tennessee 37831-6116 (United States)
A quench and directional phase transformation process has been developed to achieve grain alignment in bulk YBa[sub 2]Cu[sub 3]O[sub [ital x]] superconductors at temperatures about 100 [degree]C below the peritectic temperature. Isothermal phase transformation of quenched precursors at 890 [degree]C for 3 min is found to result in the formation of more than 75% of YBa[sub 2]Cu[sub 3]O[sub [ital x]] phase without any formation of Y[sub 2]BaCuO[sub 5]. Phase transformation at higher temperatures leads to rapid formation of Y[sub 2]BaCuO[sub 5] in addition to YBa[sub 2]Cu[sub 3]O[sub [ital x]]. A well-aligned microstructure is achieved by directional phase transformation of the quenched compacts as a rate of 10 mm/h. The magnetic field dependence of the critical current density at 77 K of the directionally phase transformed material compares well with that of melt-textured YBCO and is superior to that of magnetically aligned and sintered YBCO.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7261237
- Journal Information:
- Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 65:5; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOY SYSTEMS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL-PHASE TRANSFORMATIONS
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
GRAIN ORIENTATION
HIGH-TC SUPERCONDUCTORS
ISOTHERMAL PROCESSES
MAGNETIC FIELDS
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUATERNARY ALLOY SYSTEMS
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES