Removal of oxygen and nitrogen from niobium by external gettering

Hwan Kim, Yong; Suzuki, Ryosuke O.; Numakura, Hiroshi et al.

Journal of Alloys and Compounds, 1997, 248(1-2), 251-258

Permalink : https://hdl.handle.net/2115/50039

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アクセス権
open access
URI
https://hdl.handle.net/2115/50039
タイトル
Removal of oxygen and nitrogen from niobium by external gettering
著者
Hwan Kim, Yong ; Suzuki, Ryosuke O. ; Numakura, Hiroshi ; Wada, Hirobumi ; Ono, Katsutoshi
著者名
Hwan Kim, Yong
e-Rad_Researcher
80179275
著者名
Suzuki, Ryosuke O.
著者名
Numakura, Hiroshi
著者名
Wada, Hirobumi
著者名
Ono, Katsutoshi
言語
英語
キーワード
External Gettering
Purification of Niobium
Thermodynamics of Impurities
Oxygen Diffusion
Purity Estimation
発行日
1997-02-15
出版者
Elsevier B.V.
収録物名
Journal of Alloys and Compounds
巻(号)
248(1-2)
ページ
251-258
抄録
External gettering has a potential to remove interstitial gaseous impurities from solid niobium even below 1500K. The oxygen concentration in the deposit and the Nb bulk is evaluated by a combination of material thermodynamics and mass balance. The removal of oxygen and nitrogen was experimentally studied by using Ti, Y, Zr, Al and Si. Titanium deposited smoothly on the Nb surface in vacuum, and absorbed the gaseous impurities most efficiently. By applying Ti as an external getter on commercial niobium at 1463K, the residual resistivity ratio (RRR) reached 780. The oxygen distribution was calculated by combining thermodynamics and diffusion data. The experimental deoxidation rate was found to be slower than the calculated value. This may be attributed to the slow growth of the deposited layer, its morphology, and the interdiffused Ti-Nb alloy layer.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
0925-8388
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1016/S0925-8388(96)02679-5