Method for growing patterned thin films of superconductors

Patent · Tue Jun 27 00:00:00 EDT 1989

OSTI ID:5552857

Lessoff, H; Greene, R F

This patent describes a method for growing a patterned superconductive oxide film of the general formula XZ/sub 2/Cu/sub 3/O/sub 6+chi/, wherein X is yttrium, a lanthanide or a mixture thereof, Z is one or more alkaline earth elements and chi is a number between 0 and 1. The method consists the steps of: preparing an aqueous solution of the nitrates, of X, Z and Cu in the X:Z:Cu stoichiometric ratio of 1:2:3; spraying the aqueous solution onto a substrate heated to a temperature between at least the decomposition temperature of the nitrates in the solution and the lowest temperature above the decomposition temperature at which a film does not form on the substrate, thereby forming on the substrate a thin film of XZ/sub 2/Cu/sub 3/O/sub y/ material, wherein y is an undefined number; spot-heating preselected portions of the thin film of XZ/sub 2/Cu/sub 3/O/sub y/ material in a substantially pure oxygen atmosphere to a temperature between 800{sup 0}C and 950{sup 0}C for a time sufficient to convert the preselected portions into a patterned superconductive oxide film XZ/sub 2/Cu/sub 3/O/sub 6+chi/; and removing the unheated XZ/sub 2/Cu/sub 3/O/sub y/ material in order to leave only the patterned superconductive oxide film of XZ/sub 2/Cu/sub 3/O/sub 6+chi/ material on the substrate.

• Assignee: Secretary of the Navy, Washington, DC
• Patent Number(s): US 4843060
• Application Number: TRN: 89-026395
• OSTI ID: 5552857
• Resource Relation: Patent File Date: 23 Nov 1987
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
FABRICATION
YTTRIUM OXIDES
AQUEOUS SOLUTIONS
NITRATES
RARE EARTHS
SPRAYS
SUPERCONDUCTING FILMS
CHALCOGENIDES
COPPER COMPOUNDS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FILMS
METALS
MIXTURES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
420201* - Engineering- Cryogenic Equipment & Devices
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication
656100 - Condensed Matter Physics- Superconductivity