Doping effects of ZrC and ZrB2 in the powder-in-tube processed MgB2 tapes
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We have investigated the effects of ZrC and ZrB2 doping on the superconducting properties of the powder-in-tube processed MgB2/Fe tapes. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX), transport and magnetic measurements. We confirmed the following quite different roles of ZrC and ZrB2 in MgB2. ZrC doping was found to decrease the transport critical current density (J c) at 4.2 K, while the critical temperature (T c) kept constant. In contrast, the J c values in magnetic fields were enhanced greatly by the ZrB2 addition, which resulted in a decrease in T c by only 0.5 K. The reason for different effects of two dopants is also discussed.
KeywordsMgB2 superconducting tapes powder-in-tube critical current density doping
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