Journal of Inorganic Materials

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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

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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