Tantalum oxide and/or niobium oxide and method for preparation thereof
AssigneeStella Chemifa Corporation
InventorsHirohisa Kikuyama, Masahide Waki, Shinji Hashiguchi, Kenji Aoki
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Abstract
A method for preparing tantalum oxide and/or niobium oxide, characterized in that it comprises adding a basic aqueous solution to an aqueous solution of tantalum fluoride salt and/or niobium fluoride salt, to form tantalum hydroxide and/or niobium hydroxide, and then firing said tantalum hydroxide and/or niobium hydroxide. The above method allows the preparation of the tantalum oxide and/or niobium oxide in the state of a needle crystal or columnar crystal, not of a spherical crystal or an assemblage form.
Claims19
1-14. (canceled)
A method for preparing tantalum oxide and/or niobium oxide, the method comprising adding a basic aqueous solution to an aqueous solution of fluorotantalate and/or fluoroniobate to produce tantalum hydroxide and/or niobium hydroxide, and firing the tantalum hydroxide and/or niobium hydroxide to produce tantalum oxide and/or niobium oxide in the form of a needle-like or columnar crystal, wherein the rate of temperature rise during firing is 3 to 100° C./minute.
A method for preparing tantalum oxide and/or niobium oxide, the method comprising adding a basic aqueous solution to an aqueous solution of fluorotantalate and/or fluoroniobate to produce tantalum hydroxide and/or niobium hydroxide, and firing the tantalum hydroxide and/or niobium hydroxide to produce tantalum oxide and/or niobium oxide in the form of a needle-like or columnar crystal, wherein the rate of temperature rise during firing is 20 to 75° C./minute.
Dependencies are inferred from the claim text.