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Enhancement of synthesis efficiency and critical current density in glycine-doped MgB2 bulks by two-step sintering

Journal Article


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.

Publication Date


  • 2017

Citation


  • Cai, Q., Liu, Y., Ma, Z., Yu, L., & Li, H. (2017). Enhancement of synthesis efficiency and critical current density in glycine-doped MgB2 bulks by two-step sintering. Journal of Materials Science: Materials in Electronics, 28(7), 5645-5651. doi:10.1007/s10854-016-6235-1

Scopus Eid


  • 2-s2.0-85006929650

Web Of Science Accession Number


Start Page


  • 5645

End Page


  • 5651

Volume


  • 28

Issue


  • 7

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.

Publication Date


  • 2017

Citation


  • Cai, Q., Liu, Y., Ma, Z., Yu, L., & Li, H. (2017). Enhancement of synthesis efficiency and critical current density in glycine-doped MgB2 bulks by two-step sintering. Journal of Materials Science: Materials in Electronics, 28(7), 5645-5651. doi:10.1007/s10854-016-6235-1

Scopus Eid


  • 2-s2.0-85006929650

Web Of Science Accession Number


Start Page


  • 5645

End Page


  • 5651

Volume


  • 28

Issue


  • 7