High T/sub c/ screen-printed YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ films: Effect of the substrate material
Thick films of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ have been deposited on highly polished alumina, magnesia spinel, nickel aluminum titanate (Ni-Al-Ti), and barium tetratitanate (Ba-Ti) substrates by the screen printing technique. They were baked at 1000 /sup 0/C for 15 min, oxygen annealed at a lower temperature, and characterized by electrical resistivity measurements, x-ray diffraction, and optical and scanning electron microscopy. Properties of the films were found to be highly sensitive to the choice of the substrate material. The film on Ba-Ti turned green after firing, due to a reaction with the substrate and were insulating. A film on Ni-Al-Ti had a T/sub c/ (onset) approx.95 K and lost 90% of its resistance by approx.75 K. However, even at 4 K it was not fully superconducting, possibly due to a reaction between the film and the substrate and interdiffusion of the reaction products. The film on alumina had T/sub c/ (onset) approx.96 K, T/sub c/ (zero) approx.66 K, and ..delta..T/sub c/ (10--90%) approx.10 K. Our best film was obtained on spinel and had T/sub c/ (onset) approx.94 K, zero resistance at 81 K, and a transition width (10--90%) of approx.7 K.
- Research Organization:
- National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
- OSTI ID:
- 7203512
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 53:7; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COATINGS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DATA
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FILMS
INFORMATION
LOW TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
NICKEL COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SURFACE COATING
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES