Crystal structure and superconductive characteristics of Nb0.89Al0.11 oxynitrides

Ohashi, Yoshio; Motohashi, Teruki; Masubuchi, Yuji et al.

Journal of Solid State Chemistry, 2010, 183(7), 1710-1714

Permalink : https://hdl.handle.net/2115/43281

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アクセス権
open access
URI
https://hdl.handle.net/2115/43281
タイトル
Crystal structure and superconductive characteristics of Nb0.89Al0.11 oxynitrides
著者
Ohashi, Yoshio ; Motohashi, Teruki ; Masubuchi, Yuji ; Kikkawa, Shinichi
著者名
Ohashi, Yoshio
著者名
Motohashi, Teruki
著者名
Masubuchi, Yuji
著者名
Kikkawa, Shinichi
言語
英語
キーワード
Niobium-aluminum oxynitrides
Crystal structure
Superconductivity
Structural transformation
発行日
2010-07
出版者
Elsevier
収録物名
Journal of Solid State Chemistry
巻(号)
183(7)
ページ
1710-1714
抄録
The crystal structure and superconductive characteristics of the niobium-aluminum oxynitrides were investigated. Single-phase products were successfully obtained starting from a cation ratio of Nb0.89Al0.11. The as-nitrided product crystallized in a cation-deficient rock-salt type structure with a chemical formula of (Nb0.60Al0.08 □0.32)(O0.21N0.79), while annealing at 1773 K under a nitrogen pressure of 0.5 MPa led to a highly crystallized product with a simple rock-salt type structure represented as (Nb0.89Al0.11)(O0.17N0.85). Upon post-annealing, both the critical temperature (Tc) and the superconductive volume fraction (V_[SC]) of the oxynitride were significantly enhanced from Tc ≈ 7 K and V_[SC]=23% for the as-nitrided product to Tc = 17.3 K and V_[SC]=91% for the post-annealed product.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
0022-4596
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1016/j.jssc.2010.05.023