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Structure of MgB2 Ceramics Synthesized with Excess of Magnesium after Cold Deformation and Annealing

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract—In a bulk MgB2 compound synthesized with an excess of magnesium, a structure that could provide high critical currents has been obtained as a result of deformation by upsetting and subsequent annealing at 650°C for 7 h. The investigation of this structure using X-ray diffraction and scanning and transmission electron microscopy methods has shown that a dense nanosized matrix MgB2 phase with good intergrain bonding is formed in the obtained material. In the matrix phase, there are uniformly distributed dispersed inclusions of MgO, which could serve as pinning centers.

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ACKNOWLEDGMENTS

The investigations were performed using the equipment of the Center of Collaborative Access “Test Center of Nanotechnologies and Advanced Materials,” Institute of Metal Physics, Ural Branch, Russian Academy of Sciences.

The authors thank V.P. Pilyugin for the deformation of the samples and the staff of the National Science Center “Kharkov Institute of Physics and Technologies” M.A. Tikhonovskii and I.F. Kislyak, who supplied us with the initial samples.

Funding

The work was performed within the framework of the state task according to the theme “Davlenie,” no. АААА-А18-118020190104-3 and was supported by the project of the Ural Branch, Russian Academy of Sciences, no. 18-10-2-24.

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    E. I. Kuznetsova, T. P. Krinitsina, M. V. Degtyarev & Yu. V. Blinova

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  1. E. I. Kuznetsova
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  2. T. P. Krinitsina
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  3. M. V. Degtyarev
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  4. Yu. V. Blinova
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Correspondence to E. I. Kuznetsova.

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Translated by G. Salnikov

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Kuznetsova, E.I., Krinitsina, T.P., Degtyarev, M.V. et al. Structure of MgB2 Ceramics Synthesized with Excess of Magnesium after Cold Deformation and Annealing. Phys. Metals Metallogr. 120, 867–873 (2019). https://doi.org/10.1134/S0031918X19090060

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  • DOI: https://doi.org/10.1134/S0031918X19090060

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