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Distribution of Iron Atoms in Nonequivalent Crystallographic Sites of Fe7C3 Carbide in Core–Shell Nanostructures

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Abstract

The structure and magnetic properties of iron carbide nanoparticles encapsulated into carbon shells, obtained as a result of ferrocene transformations at a pressure of 8 GPa and different temperatures, have been investigated by powder X-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy. It is found that the main crystalline carbide states are hexagonal phase Fe7C3 and cementite Fe3C, whose relative contents are determined by the treatment temperature. Mössbauer spectroscopy was used to identify three nonequivalent states of iron atoms in the structural sites of Fe7C3 hexagonal lattice. It is established that the occupancies of these sites differ from the known values for the bulk material, which is related to the specific features of structure formation under conditions of high pressure and temperature.

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ACKNOWLEDGMENTS

This study was supported by Russian Science Foundation (grant no. 14-12-00848 P) in the part of Mössbauer spectroscopy, by Russian Foundation for Basic Research (grant no. 18-03-00939) in the part of sample synthesis and electron microscopy research, by the Ministry of Science and Higher Education within the State assignment FSRC “Crystallography and photonics” RAS in the part of X-ray diffraction research, and by the program of the Presidium of the Russian Academy of Sciences no. 32 “Nanostructures: physics, chemistry, biology, technology fundamentals” in the part of data analysis.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia

    A. O. Baskakov, S. S. Starchikov, I. S. Lyubutin & Yu. L. Ogarkova

  2. Institute of High-Pressure Physics, Russian Academy of Sciences, 142190, Troitsk, Moscow oblast, Russia

    V. A. Davydov & L. F. Kulikova

  3. Moscow State University, Moscow, Russia

    T. B. Egorova

  4. Université François-Rabelais, 37000, Tours, France

    V. N. Agafonov

  5. Moscow Aviation Institute (National Research University), 125993, Moscow, Russia

    I. Yu. Starchikova

Authors
  1. A. O. Baskakov
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  2. S. S. Starchikov
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  3. I. S. Lyubutin
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  4. Yu. L. Ogarkova
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  5. V. A. Davydov
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  6. L. F. Kulikova
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  7. T. B. Egorova
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  8. V. N. Agafonov
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  9. I. Yu. Starchikova
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Correspondence to A. O. Baskakov.

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Translated by Yu. Sin’kov

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Baskakov, A.O., Starchikov, S.S., Lyubutin, I.S. et al. Distribution of Iron Atoms in Nonequivalent Crystallographic Sites of Fe7C3 Carbide in Core–Shell Nanostructures. Crystallogr. Rep. 64, 331–336 (2019). https://doi.org/10.1134/S1063774519020056

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  • DOI: https://doi.org/10.1134/S1063774519020056

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