In this work, the effect of do** with 5% to 20% poly zinc acrylate (PZA) complexes on MgB2 phase formation was studied. The changes of the lattice parameter and the amount of substituted carbon in the microstructure as well as the critical temperature and the critical current density (J c) of bulk MgB2 have been studied systematically. Both differential thermal analysis–thermogravimetric (DTA–TG) analysis and infrared (IR) spectrometry results show that the PZA was decomposed between 400°C and 600°C, and the main decomposition products were carbonized polymers and ZnO. The lattice parameter a in all PZA-doped MgB2 samples was decreased by different degrees, which indicates gradual substitution of carbon on the boron sites in the MgB2 crystal structure. Compared with the undoped sample, the J c values of all the doped samples were enhanced by about an order of magnitude under high magnetic fields. The J c value of the MgB2 sample with 20% PZA do** sintered at 800°C for 1 h reached 8 kA/cm2 at 5 K and 8 T. Transmission electron microscopy (TEM) images revealed a considerable amount of second-phase particles of ~5 nm size, and a high density of dislocations was observed in the MgB2 grains.
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Zhang, Z., Suo, H., Ma, L. et al. The Effect of Do** with the Polymer Metallic Complex Poly Zinc Acrylate on Superconducting Bulk MgB2 . J. Electron. Mater. 40, 1369–1376 (2011). https://doi.org/10.1007/s11664-011-1535-y
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DOI: https://doi.org/10.1007/s11664-011-1535-y