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Sol-gel preparation of ion-conducting ceramics for use in thin films

Thesis/Dissertation ·
DOI:https://doi.org/10.2172/10133489· OSTI ID:10133489
 [1]
  1. Univ. of California, Berkeley, CA (United States)
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A metal alkoxide sol-gel solution suitable for depositing a thin film of La0.6Sr0.4CoO3 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 National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC03-76SF00098
OSTI ID:
10133489
Report Number(s):
LBL--33364; ON: DE93007720
Country of Publication:
United States
Language:
English

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Related Subjects

30 DIRECT ENERGY CONVERSION
300503
36 MATERIALS SCIENCE
360201
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105
CERIUM OXIDES
COBALT OXIDES
DEPOSITION
ELECTRODES
FUEL CELLS
HYDROLYSIS
LANTHANUM OXIDES
MATERIALS, COMPONENTS, AND AUXILIARIES
MEMBRANES
OXYGEN
PREPARATION AND FABRICATION
SEPARATION PROCEDURES
SEPARATION PROCESSES
SOL-GEL PROCESS
STRONTIUM OXIDES
SYNTHESIS
THIN FILMS
YTTRIUM OXIDES