Distribution of Iron Atoms in Nonequivalent Crystallographic Sites of Fe7C3 Carbide in Core–Shell Nanostructures
- Authors: Baskakov A.O.1, Starchikov S.S.1, Lyubutin I.S.1, Ogarkova Y.L.1, Davydov V.A.2, Kulikova L.F.2, Egorova T.B.3, Agafonov V.N.4, Starchikova I.Y.5
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Affiliations:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences
- Institute of High-Pressure Physics, Russian Academy of Sciences
- Moscow State University
- Université François-Rabelais
- Moscow Aviation Institute (National Research University)
- Issue: Vol 64, No 2 (2019)
- Pages: 331-336
- Section: Nanomaterials and Ceramics
- URL: https://journals.rcsi.science/1063-7745/article/view/193871
- DOI: https://doi.org/10.1134/S1063774519020056
- ID: 193871
Cite item
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.
About the authors
A. O. Baskakov
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Author for correspondence.
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow, 119333
S. S. Starchikov
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow, 119333
I. S. Lyubutin
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow, 119333
Yu. L. Ogarkova
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow, 119333
V. A. Davydov
Institute of High-Pressure Physics, Russian Academy of Sciences
Email: arseniybaskakov@gmail.com
Russian Federation, Troitsk, Moscow oblast, 142190
L. F. Kulikova
Institute of High-Pressure Physics, Russian Academy of Sciences
Email: arseniybaskakov@gmail.com
Russian Federation, Troitsk, Moscow oblast, 142190
T. B. Egorova
Moscow State University
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow
V. N. Agafonov
Université François-Rabelais
Email: arseniybaskakov@gmail.com
France, Tours, 37000
I. Yu. Starchikova
Moscow Aviation Institute (National Research University)
Email: arseniybaskakov@gmail.com
Russian Federation, Moscow, 125993