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MgB2+x (x = -0.3 - 3.3) tapes were fabricated by the in-situ powder-in-tube method with two-stage heat treatment, starting from amorphous B powder and Mg flakes to avoid excessive oxidation. The MgB2 tapes without final heat-treatment have a two-stage transition due to inter-granular decoupling. The two-stage heat treatment brought about an enhancement of core density and a strong inter-granular connectivity...
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