High performance YBCO films. Report for 25 May-25 August 1994

Technical Report · Thu Aug 25 00:00:00 EDT 1994

OSTI ID:6997841

Denlinger, E J; Fathy, A; Kalokitis, D; Pendrick, V; Thaler, B

High quality YBCO films were successfully deposited on 2.5 cm by 2.5 cm magnesium fluoride substrates. Critical temperatures of 88-89K and transition widths of 0.5K were obtained. Surface quality of Sarnoff-polished magnesium fluoride was improved to a level that produced a Chi-min of about 17% using Rutherford Backscattering. The maximum STO dielectric layer thickness (for capacitor between ground plane and power plane layers) was found to be 2000 angstroms or less in order to allow re-oxygenation of underlying YBCO ground plane. A new bismuth oxide based glass for bonding of the YBCO sample to the metal handle was identified. This glass showed significantly less interaction with silver and better stability at 750K under vacuum than the previously used PbO-based glass. A five micron thick silver layer for the power plane was found sufficient for preventing any reduction of its conductivity due to interaction with the bonding glass during firing. Patterned glass/metal handle attachment to YBCO samples showed good adhesion.

• Research Organization: David Sarnoff Research Center, Princeton, NJ (United States)
• OSTI ID: 6997841
• Report Number(s): AD-A-283870/4/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
SYNTHESIS
TRANSITION TEMPERATURE
THIN FILMS
BARIUM OXIDES
COPPER OXIDES
MAGNESIUM FLUORIDES
SUBSTRATES
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FILMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MAGNESIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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Cermets
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360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)