Sol-gel preparation of ion-conducting ceramics for use in thin films. [LaSrCoO[sub 3]; SrCeY[sub x]O[sub 3]]
A metal alkoxide sol-gel solution suitable for depositing a thin film of La[sub 0.6]Sr[sub 0.4]CoO[sub 3] on a porous substrate has been developed; such films should be useful in fuel cell electrode and oxygen separation membrane manufacture. Crack-free films have been deposited on both dense and porous substrates by dip-coating and spin-coating techniques followed by a heat treatment in air. Fourier transform infrared spectroscopy was used to determine the chemical structure of metal alkoxide solution system. X-ray diffraction was used to determine crystalline phases formed at various temperatures, while scanning electron microscopy was used to determine physical characteristics of the films. Surface coatings have been successfully applied to porous substrates through the control of the substrate pore size, deposition parameters, and firing parameters. Conditions have been defined for which films can be deposited, and for which the physical and chemical characteristics of the film can be improved. A theoretical discussion of the chemical reactions taking place before and after hydrolysis in the mixed alkoxide solutions is presented, and the conditions necessary for successful synthesis are defined. Applicability of these films as ionic and electronic conductors is discussed.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6732149
- Report Number(s):
- LBL-33364; ON: DE93007720
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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Components
& Auxiliaries
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ALKALINE EARTH METAL COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
DECOMPOSITION
DEPOSITION
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FILMS
FUEL CELLS
HYDROLYSIS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LYSIS
MEMBRANES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SEPARATION PROCESSES
SOL-GEL PROCESS
SOLVOLYSIS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SYNTHESIS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES