Spin-on Bi/sub 4/Sr/sub 3/Ca/sub 3/Cu/sub 4/O/sub 16/. mu. /sub x/ superconducting thin films from citrate precursors
Thin films in the Bi-Sr-Ca-Cu-O system have been synthesized from homogeneous liquid citrate precursors by a spin-coating and pyrolysis method. Films prepared on SrTiO/sub 3/ substrates of (100) orientation show strongly textured orientations with the c axis of the predominant Bi/sub 4/ Sr/sub 3/ Ca/sub 3/ Cu/sub 4/ O/sub 16/..mu../sub x/ phase normal to the film plane. In a single coating and firing, crack-free films of 0.2--0.5 ..mu..m thickness are obtained. For films fired to peak temperatures of 850--875 /sup 0/C, linearly decreasing resistance with temperature is observed, with rho (300 K)approx.460 ..mu cap omega.. cm and rho (300 K)rho (100 K)approx.2.4. Clear onsets of superconductivity are observed at 90--100 K, with occasional films showing smaller resistant drops at 110--120 K. For all films, T/sub c/ (R = 0) occurs in the range 70--75 K. High critical current densities at 4.2 K of 5--8 x 10/sup 5/ Acm/sup 2/ are measured by direct transport.
- Research Organization:
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
- OSTI ID:
- 5312305
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 52:25
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH OXIDES
CRITICAL CURRENT
SPIN-ON COATING
TRANSITION TEMPERATURE
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
SPIN-ON COATINGS
SUPERCONDUCTING FILMS
FABRICATION
TITANIUM OXIDES
CITRATES
CURRENT DENSITY
EXPERIMENTAL DATA
HIGH TEMPERATURE
LOW TEMPERATURE
PYROLYSIS
SUPERCONDUCTIVITY
THIN FILMS
VERY HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
COPPER COMPOUNDS
CURRENTS
DATA
DECOMPOSITION
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SURFACE COATING
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360204 - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity