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- W2020234549 abstract "We have studied grain coupling and critical current density (Jc) in ex situ processed Fe-sheathed MgB2?xCx (x = 0, 0.05 and 0.10) tapes fabricated by a powder-in-tube (PIT) technique. Compared with commercially available MgB2 powder, homemade powders of MgB2?xCx contained larger amounts of MgO. Therefore, tapes using these homemade powders showed much lower Jc values. Chemical treatment of the homemade powders in acid solutions brought about a large enhancement in Jc of tapes, mainly due to the dissolution of MgO. The transport Jc values of tapes were almost the same at 4.2?K and 10?T for both powders with chemical treatment, independent of x, although tapes using powders with x?0.05 showed a large enhancement in normalized volume pinning force (Fp) in the high-field region and small field dependence in Jc due to carbon substitution. This can be attributed to high temperature heat treatment for ex situ processed MgB2 tapes. At sintering, MgB2?xCx probably partially decomposes into MgB2, MgB4 and C, producing precipitates at grain boundaries. This brings about weak coupling of grains and hence negligible enhancement in the low-field region in Jc of tapes with x?0.05." @default.
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- W2020234549 date "2008-07-17" @default.
- W2020234549 modified "2023-09-26" @default.
- W2020234549 title "Grain coupling and critical current density in Fe-sheathed carbon-substituted MgB2tapes fabricated through anex situprocess using chemically treated powder" @default.
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- W2020234549 doi "https://doi.org/10.1088/0953-2048/21/9/095018" @default.
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