Preparation of tantalum powders by the reduction of complex oxyfluoride compounds with sodium |
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Authors: | V N Kolosov M N Miroshnichenko T Yu Prokhorova V M Orlov |
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Affiliation: | 1.Tananaev Institute of Chemistry and Technology of Rare Elements and Minerals, Kola Scientific Center,Russian Academy of Sciences,Apatity, Murmansk oblast,Russia |
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Abstract: | The substances most suitable for use as oxygen-containing additives for the sodium-thermal fabrication of finely dispersed tantalum powder (K2Ta2O3F6, K3TaOF6, K2TaOF5, and KTaOF4) are selected based on the thermodynamic and experimental investigations of reduction reactions of tantalum compounds with sodium from the melts containing complex oxyfluorides compounds. The application of the mentioned compounds gives the opportunity to fabricate tantalum powders with a specific surface area at a level of 3–5 m2/g, which is 8- to 10-fold higher than for the powders fabricated under the same conditions when reducing K2TaF7. It is shown that fabricated tantalum powders can be needed as the initial material for the development of the capacitor powder with a charge of 70000–100000 μFV/g. |
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