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Structure and misorientation angle distributions of (001) twist grain boundaries in Bi2Sr2Ca1Cu2Oy/Ag composite tapes processed in different oxygen partial pressures

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Abstract

We investigated the relationship between the structure and misorientation angle of (001) twist grain boundaries in Bi2Sr2Ca1Cu2Oy/Ag composite tapes processed in different oxygen partial pressures (PO2 = 0.01, 0.21, and 1 atm). Large-angle misoriented twist boundaries (>10°) essentially had no amorphous layers at the interface, and the misorientation angles of these boundaries mostly corresponded to low-energy misorientations. This large-angle misoriented boundary structure was independent of PO2. Small-angle misoriented twist boundaries (<10°), on the other hand, corresponded to high-energy misorientations and sometimes had amorphous layers at the interface. The population of the small-angle boundary with an amorphous layer was very low in the tape processed in PO2 = 1 atm. This suggests that high PO2 during the heat treatment is effective in the improvement of grain coupling, and hence, to increase critical current density.

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Authors and Affiliations

  1. National Research Institute for Metals, 1-2-1, Sengen, 305-0047, Tsukuba, Ibaraki, Japan

    Hiroki Fujii, Hiroaki Kumakura & Kazumasa Togano

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  1. Hiroki Fujii
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  2. Hiroaki Kumakura
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  3. Kazumasa Togano
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Fujii, H., Kumakura, H. & Togano, K. Structure and misorientation angle distributions of (001) twist grain boundaries in Bi2Sr2Ca1Cu2Oy/Ag composite tapes processed in different oxygen partial pressures. Journal of Materials Research 14, 349–353 (1999). https://doi.org/10.1557/JMR.1999.0051

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  • DOI: https://doi.org/10.1557/JMR.1999.0051

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