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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Ar气氛退火对LRE-Ba-Cu-O单畴熔融织构样品超导性能的影响

代建清1,2, 赵忠贤2
  

  1. 1. 昆明理工大学 材料与冶金工程学院, 昆明 650093; 2. 中国科学院 物理研究所超导国家重点实验室, 北京 100080
  • 收稿日期:2007-03-07 修回日期:2007-05-16 出版日期:2008-03-20 网络出版日期:2008-03-20

Effect of Post-annealing in Ar on Performance of LRE-Ba-Cu-O Single-grain Superconductors

DAI Jian-Qing1,2, ZHAO Zhong-Xian2

  

  1. 1. Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2007-03-07 Revised:2007-05-16 Published:2008-03-20 Online:2008-03-20

PDF (PC)

1857

被引次数

5 | 2

摘要： 采用顶部热籽晶技术和“二步冷却”生长工艺, 在空气中制备了Gd-Ba-Cu-O、(SmGd)-Ba-Cu-O和(SmEuGd)-Ba-Cu-O三种体系的单畴熔融织构样品, 并研究了Ar气氛退火(ArPA)对所制备的单畴样品超导性能的影响. 结果表明, 三种体系的单畴样品77K下的俘获场分布均呈中心对称的圆锥形, 其中SEG样品的冻结场达到0.34T(φ18mm), 与OCMG工艺制备的相同尺寸的样品处在同一水平. Ar气氛退火对三种体系单畴样品超导性能的影响不同: 对Gd-Ba-Cu-O体系, ArPA不能进一步提高单畴样品的临界电流密度; 而对(SmGd)-Ba-Cu-O和(SmEuGd)-Ba-Cu-O体系, 合适温度下的ArPA可以大幅度提高样品的超导性能.

关键词: LRE-Ba-Cu-O, 熔融织构, Ar气氛退火

Abstract: Single-grain bulks of Gd-Ba-Cu-O, (SmGd)-Ba-Cu-O and (SmEuGd)-Ba-Cu-O superconductors with high performance were successfully fabricated via two-step cooling method and top-seeded-melt-growth in the ambient atmosphere. The trapped field distributions at 77K were perfect symmetric, and the maximum value of trapped field for (SmEuGd)-Ba-Cu-O sample (φ18mm) reaches 0.34T, which is comparable with that obtained through OCMG method. The effects of post-annealing in Ar (ArPA) are different for the three LRE-Ba-Cu-O systems. For Gd-Ba-Cu-O system, ArPA cannot improve the superconducting properties. For (SmGd)-Ba-Cu-O and (SmEuGd)-Ba-Cu-O systems, however, their superconducting performances can be enhanced by appropriate ArPA treatment.

Key words: LRE-Ba-Cu-O, melt-processing, post-annealing in Ar

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