Abstract
Glycine (Gly)-doped and Cu-and-Gly-co-doped MgB2 samples were two-step synthesized by a short 800 °C period followed by sintering at 600 °C for 2 h. In view of the depression of oxidation and the significant reduction of the synthesis time, the sintering efficiency was improved due to the instantaneous high-temperature process, in contrast with the one-step sintered samples at 800 °C. The critical current density was examined to be 5.1 × 103 and 8.4 × 103 A cm− 2 at 20 K and 3 T for the Gly-doped and the co-doped samples, respectively. Such enhancement, with respect to the one-step sintered un-doped sample, is attributed to the fine MgO (~20 nm) and Mg2Cu (~10 nm) pinning centers. The MgO and Mg2Cu in the co-doped sample precipitated at the grain boundary and within the grains, respectively. Besides, the residual Mg phase in the Gly-doped sample remained on the surface of the MgB2 grains, which proved the screw-dislocation growth of the MgB2 grains, i.e. the grains extended from inner center to outer zone at low temperature.
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Acknowledgements
The authors are grateful to the China National Funds for Distinguished Young Scientists (Granted No. 51325401), the National Natural Science Foundation of China (Granted No. 51474156 and U1660201), the National High Technology Research and Development Program of China (Granted No. 2015AA042504) for grant and financial support.
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Cai, Q., Liu, Y., Ma, Z. et al. Enhancement of synthesis efficiency and critical current density in glycine-doped MgB2 bulks by two-step sintering. J Mater Sci: Mater Electron 28, 5645–5651 (2017). https://doi.org/10.1007/s10854-016-6235-1
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DOI: https://doi.org/10.1007/s10854-016-6235-1