Method of preparing ceramic powders using ammonium oxalate
First Claim
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1. A method comprising:
- providing a plurality of precursor materials in solution, wherein each of the plurality of precursor materials in solution further comprises at least one constituent ionic species of a ceramic powder,combining the plurality of precursor materials in solution with an ammonium oxalate precipitant solution to cause co-precipitation of the ceramic powder in a combined solution; and
separating the ceramic powder from the combined solution.
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Abstract
Wet-chemical methods involving the use of water-soluble hydrolytically stable metal-ion chelate precursors and an ammonium oxalate precipitant can be used in a coprecipitation procedure for the preparation of ceramic powders. Both the precursor solution and the ammonium oxalate precipitant solution are at neutral or near-neutral pH. A composition-modified barium titanate is one of the ceramic powders that can be produced. Certain metal-ion chelates can be prepared from 2-hydroxypropanoic acid and ammonium hydroxide.
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Citations
26 Claims
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1. A method comprising:
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providing a plurality of precursor materials in solution, wherein each of the plurality of precursor materials in solution further comprises at least one constituent ionic species of a ceramic powder, combining the plurality of precursor materials in solution with an ammonium oxalate precipitant solution to cause co-precipitation of the ceramic powder in a combined solution; and separating the ceramic powder from the combined solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A substantially contaminant-free ceramic powder produced by a process comprising:
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providing a plurality of precursor materials in solution, wherein each of the plurality of precursor materials in solution further comprises at least one constituent ionic species of the ceramic powder, and wherein at least one of the plurality of precursor materials in solution is a chelate solution; combining the plurality of precursor materials in solution with an ammonium oxalate precipitant solution to cause coprecipitation of the ceramic powder in a combined solution; and separating the ceramic powder from the combined solution. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification