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US 6,274,110 B1Granted
Process for preparing amorphous complex oxide precursors and products produced therefrom
AssigneeYuen Shik Kim
InventorsYeun Shik Kim, Geon Bae Kim, Min Young Jo
Life of this patent
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Abstract
The present invention relates to complex oxides used as raw materials for fine ceramic materials, and more particularly to complex oxide precursors in the form of a fine powder which are readily converted to complex oxides with low energy and also a process for preparing the same.
Claims9
A process for preparing amorphous complex oxide precursors comprising the steps of:
- mixing at least one hydrated metal nitrate solution, wherein the metal is selected from the group consisting of aluminum and rare earth elements, with carbohydrazide to produce a mixture;
- heating the mixture in the presence of water in a controlled manner without ignition to a temperature that is sufficient to form a homogeneous melt;
- and
- further heating in a controlled manner without ignition at a heating rate of 1 to 100° C. per minute to decompose the melt and to form an amorphous complex oxide precursor.
1 more element
A process for preparing crystalline complex oxides comprising the steps of:
- mixing at least one hydrated metal nitrate solution, wherein the metal is selected from the group consisting of aluminum and rare earth elements, with carbohydrazide to produce a mixture;
- heating the mixture in the presence of water within a temperature range from a first temperature sufficient to form a homogeneous melt at a heating rate of 1 to 100° C. per minute without ignition to produce an amorphous complex oxide precursor;
- and
- further heating the complex oxide precursor to a crystallizing temperature to form a crystalline complex oxide.
1 more element
A process for preparing amorphous complex oxide precursors comprising the steps of:
- mixing at least one hydrated metal nitrate solution, wherein the metal is selected from the group consisting of aluminum and rare earth elements, with carbohydrazide to produce a mixture;
- and
- heating the mixture in the presence of water without causing it to ignite within a temperature range defined by a first temperature sufficient to form a homogeneous melt and a second temperature at a heating rate of 1 to 100° C. per minute to decompose the melt and to form an amorphous complex oxide precursor.
Dependencies are inferred from the claim text.