Proton conducting ceramics in membrane separations
AssigneesSavannah River Nuclear Solutions, LLC, University of South Carolina
InventorsKyle S. Brinkman, Paul S. Korinko, Elise B. Fox, Frank Chen
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Abstract
Perovskite materials of the general formula SrCeO3 and BaCeO3 are provided having improved conductivity while maintaining an original ratio of chemical constituents, by altering the microstructure of the material. A process of making Pervoskite materials is also provided in which wet chemical techniques are used to fabricate nanocrystalline ceramic materials which have improved grain size and allow lower temperature densification than is obtainable with conventional solid-state reaction processing.
Claims7
A nanocrystalline conducting ceramic having the formula ACexM1-xO3 where A can be Sr or Ba and M is selected from the group consisting of Y, Yb, Eu, Gd, Sm and X varies from 1 to 0 having at least about a 3% weight loss of oxygen while maintaining the ratio of chemical constituents within the ceramic.
A process of making a nanocrystalline conducting ceramic comprising the steps of:
- providing a stoichiometric ratio of precursor reactants in an aqueous solution;
- adding urea and a PVA solution to the precursor reactants, said urea decomposing to NH3 and CO2 thereby forming a dough precursor;
- heating said dough precursor to obtain an amorphous precursor powder;
- and
- sintering said precursor powder to form a membrane.
A nanocrystalline conducting ceramic having the formula ACexM1-xO3 where A can be Sr or Ba and M is selected from the group consisting of Y, Yb, Eu, Gd, Sm and X varies from 1 to 0, the nanocrystalline conducting ceramic having an average grain size of about 1.0 micron.
Dependencies are inferred from the claim text.