The properties of Y sub 1 Ba sub 2 Cu sub 3 O sub 7 minus. delta. thin films with silver doping prepared by spray pyrolysis

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345038· OSTI ID:6974327

Cukauskas, E J; Allen, L H; Newman, H S; Henry, R L; Van Damme, P K ^[1]

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1. Naval Research Laboratory, Electronics Science and Technology Division, Washington, DC 20375-5000 (USA)

Superconducting, silver-doped films of Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} have been deposited by spray pyrolysis of aqueous nitrate solutions onto MgO substrates. The superconducting transport properties, microstructure, and microwave losses have been characterized for various amounts of AgNO{sub 3} added to the spraying solution. These films had resistive transition temperatures between 79 and 85 K with widths from 3 to 7 K. The room-temperature resistivity was a strong function of the silver doping, dropping by a factor of 50 for the heavily doped films. Critical current densities at 4 K were typically several 10{sup 3} A/cm{sup 2} with little correlation to the silver doping. Lattice constants also were not significantly affected by the silver doping level, however, lightly doped films were denser, had the strongest {ital c} axis preferred orientation, and a smoother surface. Rf surface resistance was measured at 18 GHz, and for the best films dropped a factor of 10 below copper by 40 K. The London penetration depth was estimated to be approximately 1 {mu}m for the best films.

• OSTI ID: 6974327
• Journal Information: Journal of Applied Physics; (USA), Vol. 67:11; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRICAL PROPERTIES
MICROSTRUCTURE
COPPER OXIDES
YTTRIUM OXIDES
CRITICAL CURRENT
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
MAGNESIUM OXIDES
PENETRATION DEPTH
PYROLYSIS
SILVER
SPRAY COATING
SUPERCONDUCTING FILMS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CURRENTS
DECOMPOSITION
DEPOSITION
ELECTRIC CURRENTS
ELEMENTS
FILMS
MAGNESIUM COMPOUNDS
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SURFACE COATING
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties