Preparation of Tl sub 2 Ba sub 2 CaCu sub 2 O sub 8 superconducting thin films on sapphire substrates via a two-step chemical deposition process

Journal Article · Thu Aug 15 04:00:00 EDT 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349399· OSTI ID:5411884

Collins, B T; Ladd, J A; Matey, J R ^[1]

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1. David Sarnoff Research Center, Princeton, New Jersey (USA)

Single-phase Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin films have been deposited on single-crystal sapphire substrates, (1{bar 1}02) orientation, via a two-step chemical deposition process. Ba-Ca-Cu-O precursor films were prepared by spin coating a (Ba-Ca-Cu)-2-ethylhexanoate solution followed by a firing in oxygen at 850 {degree}C. Thallium was incorporated by heating the film in a confined surface configuration with an unfired pellet of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} composition at 870 {degree}C for 0.1 h. The resultant films (1 {mu}m thick) were oriented with the {ital c} axis normal to the substrate. The structural and chemical composition of the films was monitored by x-ray diffraction, electron microprobe, and energy dispersive x-ray analysis. The superconducting properties were characterized by resistance and mutual inductance versus temperature measurements. Zero resistance temperatures as high as 95 K have been observed.

• OSTI ID: 5411884
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:4; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CORUNDUM
CRYSTALS
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROPROBE ANALYSIS
FILMS
HIGH-TC SUPERCONDUCTORS
MICROANALYSIS
MINERALS
MONOCRYSTALS
NONDESTRUCTIVE ANALYSIS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRECURSOR
SAPPHIRE
SCATTERING
SPIN-ON COATING
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACE COATING
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE MEASUREMENT
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION