Method of forming an oxide superconducting thin film having an R sub 1 A sub 2 C sub 3 crystalline phase over an R sub 2 A sub 1 C sub 1 crystalline phase

Patent · Tue May 26 00:00:00 EDT 1992

OSTI ID:7048463

Lelental, M; Romanofsky, H J

This patent describes a process which comprises forming a mixed rare earth alkaline earth copper oxide layer on a substrate and converting the mixed rare earth alkaline earth copper oxide layer to an electrically conductive layer. It comprises crystalline R{sub 1}A{sub 2}C{sub 3} oxide phase by heating in the presence of oxygen, wherein rare earth and R is in each instance chosen from among yttrium, lanthanum, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium and alkaline earth and A is in each instance chosen from among calcium, strontium and barium, characterized in that a crystalline R{sub 2}A{sub 1}C{sub 1} oxide phase is first formed as a layer on the substrate and the crystalline R{sub 1}A{sub 2}C{sub 3} oxide phase is formed over the crystalline R{sub 2}A{sub 1}C{sub 1} oxide phase by coating a mixed rare earth alkaline earth copper oxide on the crystalline R{sub 2}A{sub 1}C{sub 1} oxide phase and heating the mixed rare earth alkaline earth copper oxide to a temperature of at least 1000{degrees} C.

• Assignee: Eastman Kodak Co., Rochester, NY (United States)
• Patent Number(s): US 5116812; A
• Application Number: PPN: US 7-545164
• OSTI ID: 7048463
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
FILMS
MATERIALS TESTING
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TESTING
TRANSITION ELEMENT COMPOUNDS