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中文摘要：
本文采用固相反应法制备了一系列纳米Pr6O11掺杂的MgB2超导块材，掺杂量分别为0，1，3，5，10wt．％．X射线衍射结果表明：随着Pr6O11掺杂量的增加，MgBe的晶格常数也逐渐增大，也就是说Pr原子部分替代了MgBe晶格中的Mg原子．磁测量结果显示，Pr6O11的掺杂对MgBe的超导转变温度（L）有很小的抑制．在低含量Pr6O11掺杂（1wt．％）时，MgBe的临界电流密度（Jc）和不可逆场（Hirr）均有明显的提高，但进一步提高PreO11的掺杂量时，会损害MgBe在高场下的性能．文中同时也讨论了Pr6O11掺杂影响MgBe的Tc和Jc性能的机理．
英文摘要：
Bulk samples of MgB2 doped with 0, 1, 3, using a solid-state reaction route. The lattice 5, 10wt. % Pr6O11 nano-powder were prepared constants of Pr6O11-doped MgB2 systematically increase with increasing doping level, indicating a substitution of Pr for Mg in the crystal structure, and consequently, superconducting transition temperature, To, of MgB2 is slightly suppressed. At low doping level of 1 wt. % Pr6O11, the critical current density, Jc, and the irreversibility field, Hi, are improved. However, at higher doping levels, Pr6O11-doping seems harmful for the performance of MgB2 in high magnetic fields. The Pr6O11-doping mechanism on Tc and Jc is also discussed.
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