Y-Ba-Cu-O系超伝導性セラミックスの水による劣化
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- Material Type
- 記事
- Author/Editor
- 引地 康夫 他
- Author Heading
- Periodical title
- 材料 / 日本材料学会 [編]
- No. or year of volume/issue
- 39(447) 1990.12
- Volume
- 39
- Issue
- 447
- Pages
- p1706～1710
- Publication date of volume/issue (W3CDTF)
- 1990-12
- ISSN (Periodical Title)
- 0514-5163
- ISSN-L (Periodical Title)
- 0514-5163
- Publication (Periodical Title)
- 京都 : 日本材料学会
- Place of Publication (Country Code)
- JP
- Text Language Code
- jpn
- NDLC
- Target Audience
- 一般
- Article Type
- 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
- Holding library
- 国立国会図書館
- Call No.
- Z14-267
- Data Provider (Database)
- 国立国会図書館 : 国立国会図書館雑誌記事索引
- Bibliographic ID (NDL)
- 3692865
- Bibliographic Record Category (NDL)
- 632
- Summary, etc.
- 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 O<sub>2</sub>, starting with Y<sub>2</sub>O<sub>3</sub>, BaCO<sub>3</sub> 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 H<sub>2</sub>O 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<sub>c</sub></i> of the 112 ceramics (25A/cm<sup>2</sup>) was smaller than 39A/cm<sup>2</sup> of 123 ceramics. The mixing composition of the 112 was the same as that of the mixture of 123 and YCuO<sub>2.5</sub> (20.5wt%). It is expected that the water resistivity and superconducting properties of the ceramics composed of 123 and YCuO<sub>2.5</sub> (3 to 15wt%) may be better than those of the 123 or 112 ceramics. The <i>T<sub>c</sub></i> (zero) and <i>J<sub>c</sub></i> (77K) of these ceramics (123-YCuO<sub>2.5</sub>) were about 92K and 28-60A/cm<sup>2</sup>, respectively.However, the <i>J<sub>c</sub></i> of these ceramics when kept in water at 20°C for only 1 day decreased below 5A/cm<sup>2</sup>, in spite of these ceramics being black and having Meissner effect. When kept in salad oil, these ceramics were still black, and <i>T<sub>c</sub></i> (zero) and <i>J<sub>c</sub></i> were about 92K and 18-53A/cm<sup>2</sup> even after 90 days. It is concluded that the H<sub>2</sub>O 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
- Access Restrictions
- インターネット公開
- Data Provider (Database)
- 科学技術振興機構 : J-STAGE
- Summary, etc.
- 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 O<sub>2</sub>, starting with Y<sub>2</sub>O<sub>3</sub>, BaCO<sub>3</sub> 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 H<sub>2</sub>O 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<sub>c</sub></i> of the 112 ceramics (25A/cm<sup>2</sup>) was smaller than 39A/cm<sup>2</sup> of 123 ceramics. The mixing composition of the 112 was the same as that of the mixture of 123 and YCuO<sub>2.5</sub> (20.5wt%). It is expected that the water resistivity and superconducting properties of the ceramics composed of 123 and YCuO<sub>2.5</sub> (3 to 15wt%) may be better than those of the 123 or 112 ceramics. The <i>T<sub>c</sub></i> (zero) and <i>J<sub>c</sub></i> (77K) of these ceramics (123-YCuO<sub>2.5</sub>) were about 92K and 28-60A/cm<sup>2</sup>, respectively.However, the <i>J<sub>c</sub></i> of these ceramics when kept in water at 20°C for only 1 day decreased below 5A/cm<sup>2</sup>, in spite of these ceramics being black and having Meissner effect. When kept in salad oil, these ceramics were still black, and <i>T<sub>c</sub></i> (zero) and <i>J<sub>c</sub></i> were about 92K and 18-53A/cm<sup>2</sup> even after 90 days. It is concluded that the H<sub>2</sub>O 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
- Related Material (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- Japan Link Center雑誌記事索引データベースCrossrefCiNii Articles
- Bibliographic ID (NDL)
- 3692865
- NAID
- 110002297844