中文摘要：

我们调查了 ZrC 的效果，在 powder-in-tube 的超导的性质上做的 ZrB_2 处理了 MgB_2Fe 磁带。样品被 X 光检查衍射(XRD ) 描绘，扫描电子显微镜学(SEM/EDX ) ，运输和磁性的大小。我们在 MgB_2 证实了 ZrC 和 ZrB_2 的下列相当不同的角色。做的 ZrC 被发现运输到减少在 4.2 K 的批评电流密度(J_C ) ，当临界溶液温度(T_C ) 保持不变时。相反，在磁场的 J_C 价值被 ZrB_2 增加极大地提高，它由仅仅 0.5 K 在 T_C 导致了减少。为二掺杂物的不同效果的原因也被讨论。

英文摘要：

We have investigated the effects of ZrC and ZrB2 doping on the superconducting properties of the powder-in-tube processed MgB2/Fe tapes. Sampies 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 （Jc） at 4.2 K, while the critical temperature （To） kept constant. In contrast, the Jc values in magnetic fields were enhanced greatly by the ZrB2 addition, which resulted in a decrease in Tc by only 0.5 K. The reason for different effects of two dopants is also discussed.