Thermal and chemical stability of the ß-W2N nitride phase

R. Mateus; M.C. Sequeira; C. Porosnicu; C.P. Lungu; Antti Hakola; E. Alves

doi:10.1016/j.nme.2017.03.040

Thermal and chemical stability of the ß-W2N nitride phase

R. Mateus^*
, M.C. Sequeira
, C. Porosnicu
, C.P. Lungu
, Antti Hakola
, E. Alves

^*Corresponding author for this work

Universidade de Lisboa
National Institute for Lasers, Plasma and Radiation Physics (INFLPR)

Research output: Contribution to journal › Article › Scientific › peer-review

20 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/cm². Ion beam and X-ray diffraction analysis evidenced the formation of the α-Be₃N₂ and β-W₂N 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⁺/cm² and to the compact FCC β-W₂N structure at 5e17 N⁺/cm². Thermal stability of β-W₂N 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-W₂N over the annealing range and to the thermal stability of the nitride phase up to 1073 K.

Original language	English
Pages (from-to)	462-467
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2017.03.040
Publication status	Published - 1 Aug 2017
MoE publication type	A1 Journal article-refereed

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053. The activity was performed in the scope of the WP PFC programme. IST also received financial support from “ Fundação para a Ciência e a Tecnologia ” through project UID/FIS/50010/2013.

Keywords

Beryllium
Tungsten
Nitride
Thermal stability

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title = "Thermal and chemical stability of the {\ss}-W2N nitride phase",

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/cm2. Ion beam and X-ray diffraction analysis evidenced the formation of the α-Be3N2 and β-W2N 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+/cm2 and to the compact FCC β-W2N structure at 5e17 N+/cm2. Thermal stability of β-W2N 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-W2N over the annealing range and to the thermal stability of the nitride phase up to 1073 K. ",

keywords = "Beryllium, Tungsten, Nitride, Thermal stability",

author = "R. Mateus and M.C. Sequeira and C. Porosnicu and C.P. Lungu and Antti Hakola and E. Alves",

note = "Publisher Copyright: {\textcopyright} 2017 The Authors",

year = "2017",

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doi = "10.1016/j.nme.2017.03.040",

language = "English",

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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, Antti

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/cm2. Ion beam and X-ray diffraction analysis evidenced the formation of the α-Be3N2 and β-W2N 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+/cm2 and to the compact FCC β-W2N structure at 5e17 N+/cm2. Thermal stability of β-W2N 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-W2N 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/cm2. Ion beam and X-ray diffraction analysis evidenced the formation of the α-Be3N2 and β-W2N 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+/cm2 and to the compact FCC β-W2N structure at 5e17 N+/cm2. Thermal stability of β-W2N 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-W2N over the annealing range and to the thermal stability of the nitride phase up to 1073 K.

KW - Beryllium

KW - Tungsten

KW - Nitride

KW - Thermal stability

UR - https://www.scopus.com/pages/publications/85017094612

U2 - 10.1016/j.nme.2017.03.040

DO - 10.1016/j.nme.2017.03.040

M3 - Article

SN - 2352-1791

VL - 12

SP - 462

EP - 467

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

Thermal and chemical stability of the ß-W2N nitride phase

Abstract

Funding

Keywords

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