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Mechanism of the formation and specific features of the structure of massive samples of compound MgB2

  • Structure, Phase Transformations, and Diffusion
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Abstract

Using different methods, it has been revealed that two MgB2 phases with the same hexagonal lattice, which differ in the contents of Mg and B (in the limits of the homogeneity range), as well as in the concentration of impurity oxygen and in the microstructure, are formed. The regions that correspond to these two phases of MgB2 have relatively large sizes (100–500 μm) and, alternatingly, fill the entire volume of the sample. It is assumed that the two-phase state of MgB2 is due to the specific features of the mechanism of its formation (when synthesizing at 800–1000°C), which includes the stage of the melting of magnesium, the dissolution of solid boron in the melt to a concentration that corresponds to the composition of the MgB2 compound, and the subsequent crystallization of the MgB2 compound in the melt with the formation of a dendrite-like structure, which is accompanied by an appropriate redistribution of the main components and impurities.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    E. I. Kuznetsova, S. V. Sudareva, T. P. Krinitsina, Yu. V. Blinova, E. P. Romanov, Yu. N. Akshentsev & M. V. Degtyarev

  2. National Science Center Kharkov Institute of Physics and Technology, ul. Akademicheskaya 1, Kharkov, 61108, Ukraine

    M. A. Tikhonovskii & I. F. Kislyak

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  1. E. I. Kuznetsova
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  2. S. V. Sudareva
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  3. T. P. Krinitsina
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  4. Yu. V. Blinova
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  5. E. P. Romanov
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  6. Yu. N. Akshentsev
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  7. M. V. Degtyarev
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  8. M. A. Tikhonovskii
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  9. I. F. Kislyak
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Additional information

Original Russian Text © E.I. Kuznetsova, S.V. Sudareva, T.P. Krinitsina, Yu.V. Blinova, E.P. Romanov, Yu.N. Akshentsev, M.V. Degtyarev, M.A. Tikhonovskii, I.F. Kislyak, 2014, published in Fizika Metallov i Metallovedenie, 2014, Vol. 115, No. 2, pp. 186–197.

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Kuznetsova, E.I., Sudareva, S.V., Krinitsina, T.P. et al. Mechanism of the formation and specific features of the structure of massive samples of compound MgB2 . Phys. Metals Metallogr. 115, 175–185 (2014). https://doi.org/10.1134/S0031918X14020136

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  • DOI: https://doi.org/10.1134/S0031918X14020136

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