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首页> 外文期刊>IEEE Transactions on Applied Superconductivity >Critical current density and microstructures of thick monocore Bi2212 tapes grown in high magnetic fields
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Critical current density and microstructures of thick monocore Bi2212 tapes grown in high magnetic fields

机译：在强磁场中生长的单芯Bi2212厚单芯带的临界电流密度和微观结构

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摘要

Ag-sheathed Bi2212 monocore tapes with core thickness between 80 and 700 /spl mu/m were heat-treated in flowing O/sub 2/ in magnetic fields up to 15 T. A uniform high-degree of texture is achieved throughout the thickness of the tapes when heat-treated in a magnetic field (H/sub a/) whereas a large portion of nontextured region exists without magnetic field. The critical current density J/sub c/ of the tapes increases with increasing H/sub a/ due to enhancement in texture. The self field critical I/sub c/<1000 A was achieved for tapes with a core thickness of 180 /spl mu/m. However, for tapes with larger core thicknesses, I/sub c/ decreases due to inhomogeneous melting. The magnetic field is more effective in enhancing texture in the early stages of crystal growth.
机译：Ag包覆的Bi2212单芯带材（芯厚度在80和700 / spl mu / m之间）在流动的O / sub 2 /中在高达15 T的磁场中进行了热处理。在整个厚度范围内均获得了均匀的高织构度磁带在磁场（H / sub a /）中进行热处理时，而大部分无纹理区域没有磁场。由于织构的增强，带的临界电流密度J / sub c /随着H / sub a /的增加而增加。对于磁芯厚度为180 / spl mu / m的磁带，实现了自电场临界I / sub c / <1000A。然而，对于具有较大芯厚度的带，由于不均匀熔化，I / sub c /减小。磁场在晶体生长的早期阶段更有效地增强纹理。

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