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Magnesium Vapor Reduction of Tantalum Oxide Compounds in the Temperature Range 540–680°C

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Abstract—

We have studied characteristics and specific features of pore structure formation in powders prepared by reducing Ta2O5 and Mg4Ta2O9 with magnesium vapor in the temperature range 540–680°C. The results demonstrate that lowering the reduction temperature allows coarsening of the primary structure of the reduced particles to be prevented to a significant degree, thereby increasing the volume of pores less than 5 nm in diameter. This has made it possible to obtain tantalum powder with a specific surface area of 59 m2/g by reducing Ta2O5 at a temperature of 540°C. In the case of reduction of Mg4Ta2O9 under such conditions, the specific surface area of the powder decreases with decreasing reduction temperature because of the complete filling of most pores with native Ta2O5 oxide.

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  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Minerals (separate subdivision), Kola Scientific Center (Federal Research Center), Russian Academy of Sciences, 184209, Apatity, Murmansk oblast, Russia

    V. M. Orlov & E. N. Kiselev

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  1. V. M. Orlov
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Correspondence to V. M. Orlov.

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Translated by O. Tsarev

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Orlov, V.M., Kiselev, E.N. Magnesium Vapor Reduction of Tantalum Oxide Compounds in the Temperature Range 540–680°C. Inorg Mater 58, 799–805 (2022). https://doi.org/10.1134/S002016852208009X

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