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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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

TY - JOUR

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.

KW - Beryllium

KW - Tungsten

KW - Nitride

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