Thermal and chemical stability of the ß-W2N nitride phase

R. Mateus, M.C. Sequeira, C. Porosnicu, C.P. Lungu, A. Hakola, E. Alves

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    5 Citations (Scopus)

    Abstract

    Pure Be, W and Be:W mixed coatings with nominal compositions of (5:5) and (1:9) were deposited on silicon plates and implanted at room temperature with 30 keV N + ions with fluences up to 5e17 ions/cm 2. Ion beam and X-ray diffraction analysis evidenced the formation of the α-Be 3N 2 and β-W 2N nitrides. The identified tungsten nitride phase evolves from a BCC W lattice to a BCC W(N) solid solution after irradiating at a fluence of 1e17 N +/cm 2 and to the compact FCC β-W 2N structure at 5e17 N +/cm 2. Thermal stability of β-W 2N was investigated by annealing the coatings for 1 h up to 1073 K. The results point to the release of non-bonded nitrogen solute in β-W 2N over the annealing range and to the thermal stability of the nitride phase up to 1073 K.

    Original languageEnglish
    Pages (from-to)462-467
    Number of pages6
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Beryllium
    • Tungsten
    • Nitride
    • Thermal stability

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    Mateus, R., Sequeira, M. C., Porosnicu, C., Lungu, C. P., Hakola, A., & Alves, E. (2017). Thermal and chemical stability of the ß-W2N nitride phase. Nuclear Materials and Energy, 12, 462-467. https://doi.org/10.1016/j.nme.2017.03.040