Abstract
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.
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Pan, X.F., Cheng, C.H. & Zhao, Y. Effect of Rare-Earth Oxides Doping on the Superconductivity and Flux Pinning of MgB2 Superconductor. J Supercond Nov Magn 24, 1611–1616 (2011). https://doi.org/10.1007/s10948-010-1066-4
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DOI: https://doi.org/10.1007/s10948-010-1066-4