Crystal structure and superconductive characteristics of Nb0.89Al0.11 oxynitrides
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概要
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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.
著者
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鱒渕 友治
北大院工
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Masubuchi Yuji
Graduate School Of Engineering Hokkaido Univ. Sapporo 060-8628 Jpn
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Kikkawa Shinichi
Graduate School Of Engineering Hokkaido Univ.
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鱒渕 友治
北海道大学工学研究院物質化学部門
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