Thermal and chemical stability of the ß-W2N nitride phase

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

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

6 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 language	English
Pages (from-to)	462-467
Number of pages	6
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

Keywords

Beryllium
Tungsten
Nitride
Thermal stability

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@article{469a545fa52846dc95fe5283eb663713,

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/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. ",

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

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

note = "Funding Information: 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 ?Funda??o para a Ci?ncia e a Tecnologia? through project UID/FIS/50010/2013. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Funding Information: 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 “ Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia ” through project UID/FIS/50010/2013 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: {\textcopyright} 2017 The Authors Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

year = "2017",

month = aug,

day = "1",

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

language = "English",

volume = "12",

pages = "462--467",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

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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.

N1 - Funding Information: 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 ?Funda??o para a Ci?ncia e a Tecnologia? through project UID/FIS/50010/2013. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Funding Information: 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 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: © 2017 The Authors Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

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

KW - Thermal stability

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U2 - 10.1016/j.nme.2017.03.040

DO - 10.1016/j.nme.2017.03.040

M3 - Article

VL - 12

SP - 462

EP - 467

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

ER -