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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 MgB2-xCx powders contained much larger amounts of MgO. Therefore, tapes using these homemade powders showed much lower Jc values. Chemical treatment of...
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