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Scattering effect of the well-ordered MgB4 impurity phase in two-step sintered polycrystalline MgB2 with glycine addition

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Abstract

Glycine-doped MgB2 bulk was prepared by two-step sintering in this study, first at 750 °C and then 900 °C. The MgB4 particles are induced to precipitate where the dislocations concentrated after C substitution or along the steps of screw dislocation during crystal growth, forming ordered MgB4 arrays throughout the MgB2 grain. By means of atomic force microscope, the detected magnetic domains are arranged in agreement with the ordered MgB4 particles after the measurement of magnetic hysteresis loop, which supported that the nano-scale MgB4 domain structure brought strong scattering effects and indicated that atomic force microscopy could test the role of the impurities. As a result, the extrapolating upper critical field H c2(0 K) is enhanced to 22.8 T for the sample with ordered MgB4, while only 18.1 T for the un-doped sample underwent the same sintering program. Besides, carbon substitution contributed to the enhancement of H c2 as well.

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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 Nos. 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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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin, 300354, People’s Republic of China

    Qi Cai, Yongchang Liu, Qianying Guo & Zongqing Ma

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  1. Qi Cai
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  2. Yongchang Liu
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Correspondence to Yongchang Liu.

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Cai, Q., Liu, Y., Guo, Q. et al. Scattering effect of the well-ordered MgB4 impurity phase in two-step sintered polycrystalline MgB2 with glycine addition. Appl. Phys. A 123, 229 (2017). https://doi.org/10.1007/s00339-017-0855-z

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