Preparation of highly textured oxide superconducting films from MOD precursor solutions

Patent · Tue Jul 27 04:00:00 EDT 1993

OSTI ID:6326594

Cima, M J; McIntyre, P

A method is described for fabricating a textured superconducting oxide film comprising: preparing a metal-organic precursor solution containing cation constituents of the film in a stoichiometry nearly equal to the stoichiometry of the oxide film; selecting a substrate that is chemically non-inert with respect to the desired superconducting oxide; applying a coating of the precursor solution to said substrate; exposing the coating to a heat treatment comprising: a first heating at a first temperature in a first controlled atmosphere selected to decompose the precursor coating while avoiding the volatilization of a metal containing precursor constituent; a second heating at a second temperature in a second controlled atmosphere selected to create local compositional inhomogeneities in the coating; a third heating at a third temperature in a third controlled atmosphere selected to minimize the amount of transient liquid present and to form a compositionally homogeneous film; and a final heat treatment at a temperature in the range of 400 C to 500 C and in an oxygen atmosphere selected to insure that the film is fully oxygenated, thereby producing a textured superconducting oxide phase.

• Assignee: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Patent Number(s): A; US 5231074
• Application Number: PPN: US 7-510115
• OSTI ID: 6326594
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
CERAMICS
CHALCOGENIDES
COATINGS
EVAPORATION
FABRICATION
FILMS
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRECURSOR
STOICHIOMETRY
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS