Abstract
The mesoporous structure of niobium powders of specific surface areas from 32 to 150 m2/g obtained through reduction of niobium-oxide compounds by magnesium vapors has been investigated. A doubling of the specific surface area of magnesium-thermic niobium powders in comparison to tantalum powders has been shown to be caused by the larger volume and smaller size of pores. For a powder with a specific surface area of 150 m2/g, 90% of the surface is governed by pores of sizes smaller than 5 nm. Although the X-ray pattern of the powder corresponds to the metal niobium, 96.5% of this powder weight consists of a natural surface-oxide film, according to the TGA data. The thickness of this oxide decreases in comparison with the surface oxide on the compact metal depending on the powder mesoporous structure.
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Original Russian Text © V.M. Orlov, M.V. Kryzhanov, A.I. Knyazeva, R.N. Osaulenko, 2018, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2018, Vol. 54, No. 5, pp. 444–449.
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Orlov, V.M., Kryzhanov, M.V., Knyazeva, A.I. et al. Niobium Powders of Mesoporous Structure. Prot Met Phys Chem Surf 54, 782–787 (2018). https://doi.org/10.1134/S2070205118040111
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DOI: https://doi.org/10.1134/S2070205118040111