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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
Article
  • 5 Downloads

Abstract

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.

Keywords:

magnesiothermic reduction oxide compounds nitridation tantalum nitride niobium nitride powder 

Notes

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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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