Effect of Rare-Earth Oxides Doping on the Superconductivity and Flux Pinning of MgB2 Superconductor

• DOI: 10.1007/s10948-010-1066-4
• Publication Date: 2010-12-02T03:10:59Z
• Authors: X. F. Pan; C. H. Cheng; Y. Zhao
• Keywords: 0103 physical sciences; 01 natural sciences

A series of rare-earth-oxide-doped MgB2 bulks are prepared by in situ solid-state reaction with Pr6O11, CeO2, Lu2O3, and Ho2O3 as the dopants. The superconducting properties are investigated and compared with the nano-Fe3O4 doped MgB2. It is found that different from doping ferromagnetic nano-Fe3O4 which drastically suppresses superconductivity of MgB2, doping the rare-earth-oxides has little effect on superconductivity of MgB2 although most rare-earth elements have strong magnetic moment. In addition, some boride impurities formed during the reaction between rare-earth oxides and boron can work as effective pinning centers and significantly improve J c and H irr of MgB2 when these fine nanoboride precipitates (<20 nm) are embedded into the MgB2 intragrains.