Thermal and chemical stability of the ß-W2N nitride phase

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

    Research output: Contribution to journalArticleScientificpeer-review

    4 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

    Fingerprint

    Chemical stability
    Nitrides
    nitrides
    Thermodynamic stability
    thermal stability
    fluence
    Annealing
    Ions
    coatings
    Coatings
    Tungsten
    annealing
    Silicon
    X ray diffraction analysis
    Ion beams
    Solid solutions
    solutes
    tungsten
    ions
    solid solutions

    Keywords

    • Beryllium
    • Tungsten
    • Nitride
    • Thermal stability

    Cite this

    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
    Mateus, R. ; Sequeira, M.C. ; Porosnicu, C. ; Lungu, C.P. ; Hakola, A. ; Alves, E. / Thermal and chemical stability of the ß-W2N nitride phase. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 462-467.
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    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.",
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    Mateus, R, Sequeira, MC, Porosnicu, C, Lungu, CP, Hakola, A & Alves, E 2017, 'Thermal and chemical stability of the ß-W2N nitride phase', Nuclear Materials and Energy, vol. 12, pp. 462-467. https://doi.org/10.1016/j.nme.2017.03.040

    Thermal and chemical stability of the ß-W2N nitride phase. / Mateus, R.; Sequeira, M.C.; Porosnicu, C.; Lungu, C.P.; Hakola, A.; Alves, E.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 462-467.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Thermal and chemical stability of the ß-W2N nitride phase

    AU - Mateus, R.

    AU - Sequeira, M.C.

    AU - Porosnicu, C.

    AU - Lungu, C.P.

    AU - Hakola, A.

    AU - Alves, E.

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - 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.

    AB - 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.

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