Y-Ba-Cu-O系超伝導性セラミックスの水による劣化

• 資料種別: 記事
• タイトル: Y-Ba-Cu-O系超伝導性セラミックスの水による劣化
• 著者・編者: 引地 康夫 他
• 著者標目: 引地 康夫
• タイトル（掲載誌）: 材料 / 日本材料学会 [編]
• 巻号年月日等（掲載誌）: 39(447) 1990.12
• 掲載巻: 39
• 掲載号: 447
• 掲載ページ: p1706～1710
• 掲載年月日（W3CDTF）: 1990-12
• ISSN（掲載誌）: 0514-5163
• ISSN-L（掲載誌）: 0514-5163
• 出版事項（掲載誌）: 京都 : 日本材料学会
• 出版地（国名コード）: JP
• 本文の言語コード: jpn
• NDLC: ZM16
• 対象利用者: 一般
• 記事種別、記事分類: 記事分類: 化学・化学工業--無機化学・無機化学工業--非金属元素・非金属化合物--セラミックス
• 所蔵機関: 国立国会図書館
• 請求記号: Z14-267
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館雑誌記事索引; https://ndlsearch.ndl.go.jp
• 書誌ID（NDLBibID）: 3692865; http://id.ndl.go.jp/bib/3692865
• 整理区分コード: 632

• 要約等: Y-Ba-Cu-O ceramics (mixing atomic ratio (Y:Ba:Cu)=(1 to 4):(1 to 5):(1 to 6)) were prepared by solid state reactions at 950°C for 17hrs in O₂, starting with Y₂O₃, BaCO₃ and CuO. When kept in water at 20°C, most of the superconducting black ceramics became white within 1 to 2 days, due to the H₂O attack. However, the ceramics made of mixing atomic ratio 1:1:2 was still black and had Meissner effect up to 20 days. <i>J_c</i> of the 112 ceramics (25A/cm²) was smaller than 39A/cm² of 123 ceramics. The mixing composition of the 112 was the same as that of the mixture of 123 and YCuO_2.5 (20.5wt%). It is expected that the water resistivity and superconducting properties of the ceramics composed of 123 and YCuO_2.5 (3 to 15wt%) may be better than those of the 123 or 112 ceramics. The <i>T_c</i> (zero) and <i>J_c</i> (77K) of these ceramics (123-YCuO_2.5) were about 92K and 28-60A/cm², respectively.However, the <i>J_c</i> of these ceramics when kept in water at 20°C for only 1 day decreased below 5A/cm², in spite of these ceramics being black and having Meissner effect. When kept in salad oil, these ceramics were still black, and <i>T_c</i> (zero) and <i>J_c</i> were about 92K and 18-53A/cm² even after 90 days. It is concluded that the H₂O attack is very sever, but the superconducting properties are not so much damaged when kept in oil, due to the lack of water.
• DOI: 10.2472/jsms.39.1706
• オンライン閲覧公開範囲: インターネット公開
• 連携機関・データベース: 科学技術振興機構 : J-STAGE; http://www.jstage.jst.go.jp

• 要約等: Y-Ba-Cu-O ceramics (mixing atomic ratio (Y:Ba:Cu)=(1 to 4):(1 to 5):(1 to 6)) were prepared by solid state reactions at 950°C for 17hrs in O₂, starting with Y₂O₃, BaCO₃ and CuO. When kept in water at 20°C, most of the superconducting black ceramics became white within 1 to 2 days, due to the H₂O attack. However, the ceramics made of mixing atomic ratio 1:1:2 was still black and had Meissner effect up to 20 days. <i>J_c</i> of the 112 ceramics (25A/cm²) was smaller than 39A/cm² of 123 ceramics. The mixing composition of the 112 was the same as that of the mixture of 123 and YCuO_2.5 (20.5wt%). It is expected that the water resistivity and superconducting properties of the ceramics composed of 123 and YCuO_2.5 (3 to 15wt%) may be better than those of the 123 or 112 ceramics. The <i>T_c</i> (zero) and <i>J_c</i> (77K) of these ceramics (123-YCuO_2.5) were about 92K and 28-60A/cm², respectively.However, the <i>J_c</i> of these ceramics when kept in water at 20°C for only 1 day decreased below 5A/cm², in spite of these ceramics being black and having Meissner effect. When kept in salad oil, these ceramics were still black, and <i>T_c</i> (zero) and <i>J_c</i> were about 92K and 18-53A/cm² even after 90 days. It is concluded that the H₂O attack is very sever, but the superconducting properties are not so much damaged when kept in oil, due to the lack of water.
• DOI: 10.2472/jsms.39.1706; https://doi.org/10.2472/jsms.39.1706
• 関連情報（URI）: http://id.ndl.go.jp/bib/3692865; https://ndlsearch.ndl.go.jp/books/R000000004-I3692865
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: Japan Link Center; https://japanlinkcenter.org/top; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org; CiNii Articles
• 書誌ID（NDLBibID）: 3692865; http://id.ndl.go.jp/bib/3692865
• NII論文ID: 110002297844