Metalorganic deposition of high- J sub c Ba sub 2 YCu sub 3 O sub 7 minus x thin films from trifluoroacetate precursors onto (100) SrTiO sub 3

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346233· OSTI ID:6334920

McIntyre, P C; Cima, M J; Ng, M F ^[1]

---

1. Ceramics Processing Research Laboratory, Massachusetts Institute of Technology, Cambridge, MA (USA)

Superconducting thin films of Ba{sub 2}YCu{sub 3}O{sub 7-{ital x}} were prepared on (100) SrTiO{sub 3} substrates by metalorganic deposition (MOD) of trifluoroacetate precursors. The best electrical transport properties were measured in films annealed at 750 {degree}C in a humid, low P{sub O{sub 2}} gas mixture followed by slow cooling in oxygen. These specimens had sharp resistive transitions with {ital T}{sub {ital c}} above 90 K and zero-field critical current densities in excess of 10{sup 6} A/cm{sup 2} at 77 K. Critical current densities of this magnitude have not previously been reported in films produced by MOD. The highest {ital J}{sub {ital c}} obtained in films fired only in humid oxygen was 3{times}10{sup 5} A/cm{sup 2}. Annealing at high temperature in the low P{sub O{sub 2}} atmosphere also resulted in a smoother surface morphology than was observed in the oxygen-fired films. Use of the low P{sub O{sub 2}} furnace gas appeared to suppress the formation of {ital b}-axis normal oriented grains in the superconducting films and to strengthen {ital c}-axis normal texture. X-ray powder diffraction indicated the presence of {ital a}-axis normal textured material in the films, although it was not present as separate microstructural features which could be identified by scanning electron microscopy.

• OSTI ID: 6334920
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
DEPOSITION
DIFFRACTION
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MORPHOLOGY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SPIN-ON COATING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
SURFACE COATING
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES