Abstract
Spark plasma sintering (SPS) was applied for fabrication of dense (relative density >97 %) bulk MgB2 samples added with Ge. Mixtures of MgB2 and Ge powders with starting compositions (MgB2) Ge x , x=0.005, 0.01, and 0.03 were used. Added samples show enhancement of the critical current density at high magnetic fields when compared to a pristine reference sample. The optimum composition is for x=0.005 and for this sample J c(20 K) =102A/cm 2 is obtained at 5 T, while for the reference sample is obtained at 3.9 T. Ge does not substitute in the crystal lattice of MgB2 and T c,onset or T c,midpoint from magnetization measurements scatter within 0.15 or 0.3 K, respectively.
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Acknowledgments
D.B. and M.B. acknowledge financial support from the European Social Fund through POSDRU/89/1.5/S/54785 project: “Postdoctoral Program for Advanced Research in the field of nano-materials” and from the Sectoral Operational Program Human Resources Development 2007–2013 of the Romanian Ministry of European Funds through the Financial Agreement POSDRU/159/1.5/S/132395, respectively. Work at NIMP was supported from PCCE 7/2012, Romania.
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Batalu, D., Aldica, G., Burdusel, M. et al. Ge-Added MgB2 Superconductor Obtained by Ex Situ Spark Plasma Sintering. J Supercond Nov Magn 28, 531–534 (2015). https://doi.org/10.1007/s10948-014-2705-y
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DOI: https://doi.org/10.1007/s10948-014-2705-y