Ag-doped MgB2 bulk superconductors have been prepared using a standard solid state processing. The addition of Ag to MgB2 powders during the sintering process has been found to result in an important advantage, namely, the prevention/reduction of loss of Mg, a problem most commonly observed in the sintering of MgB2 bulk samples at elevated temperature and ambient pressures. The Ag-doped MgB2 sample has a distinct superconducting transition temperature around 39 K, while the undoped MgB2 undergoes only a very feeble transition to a diamagnetic superconducting state at around 39 K. The normal conducting silver regions in the MgB2 matrix acts as pinning centers resulting in the realization of high critical currents in the presence of magnetic fields.
Synthesis and Characterization of MgB2 Bulk Superconductors With Enhanced Properties by Means of Silver Doping
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Kumar, D, Yarmolenko, S, Waters, C, & Sankar, J. "Synthesis and Characterization of MgB2 Bulk Superconductors With Enhanced Properties by Means of Silver Doping." Proceedings of the ASME 2003 International Mechanical Engineering Congress and Exposition. Materials. Washington, DC, USA. November 15–21, 2003. pp. 349-352. ASME. https://doi.org/10.1115/IMECE2003-43375
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