Inorganic Materials

, Volume 55, Issue 11, pp 1118–1124 | Cite as

Synthesis of Nitrides via Magnesiothermic Reduction of Tantalum and Niobium Oxide Compounds

  • V. M. OrlovEmail author
  • R. N. Osaulenko
  • V. Ya. Kuznetsov


We have studied the feasibility of preparing tantalum and niobium nitrides by reducing Та2O5, Nb2O5, Mg4Та2O9, and Mg4Nb2O9 with magnesium vapor. The process was run in two steps: (1) reduction of the oxides at a temperature of 820°C and a residual argon pressure of 5 kPa in the reactor for 4 h and (2) nitridation of the reduction products in a nitrogen atmosphere at 820 and 900°C for 1–12 h. The phase composition of the powders after leaching out the magnesium oxide was determined on DRF-2 and DRON-4 X‑ray diffractometers. The specific surface area was determined by BET adsorption measurements on a Micromeritics TriStar II 3020 analyzer. When Ta2O5 was used as precursor, the nitridation product contained θ-TaN, ε-TaN, and Ta2N. The use of Nb2O5 as a precursor led to the formation of face-centered cubic NbN, hexagonal close-packed NbN, Nb2N, and Nb4N3. The Mg4Ta2O9 and Mg4Nb2O9 reduction products did not absorb nitrogen. The results obtained are discussed in detail.


magnesiothermic reduction oxide compounds nitridation tantalum nitride niobium nitride powder 



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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • V. M. Orlov
    • 1
    Email author
  • R. N. Osaulenko
    • 2
  • V. Ya. Kuznetsov
    • 1
  1. 1.Tananaev Institute of Chemistry and Technology of Rare Elements and Minerals, Kola Scientific Center Federal Research Center, Russian Academy of SciencesApatityRussia
  2. 2.Petrozavodsk State UniversityPetrozavodskRussia

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