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Crystal structure and superconductive characteristics of Nb0.89Al0.11 oxynitrides
| Title: | Crystal structure and superconductive characteristics of Nb0.89Al0.11 oxynitrides |
| Authors: | Ohashi, Yoshio Browse this author | | Motohashi, Teruki Browse this author | | Masubuchi, Yuji Browse this author | | Kikkawa, Shinichi Browse this author |
| Keywords: | Niobium-aluminum oxynitrides | | Crystal structure | | Superconductivity | | Structural transformation |
| Issue Date: | Jul-2010 |
| Publisher: | Elsevier |
| Journal Title: | Journal of Solid State Chemistry |
| Volume: | 183 |
| Issue: | 7 |
| Start Page: | 1710 |
| End Page: | 1714 |
| Publisher DOI: | 10.1016/j.jssc.2010.05.023 |
| Abstract: | 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. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/43281 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 本橋 輝樹
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