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On the Nature of Defects in Mn1 –xFexGe Compounds Synthesized under High Pressure

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Abstract

The mesostructure of Mn1 – xFex Ge transition-metal monogermanides is studied by small-angle neutron scattering (SANS) and ultra-SANS in a wide concentration range of x = 0.0–1.0.It is shown that the main contribution to the scattering intensity for all concentrations x is made by scattering at crystallites with sharp boundaries and sizes of 1–10 μm, which is described by the squared Lorentzian function. An additional contribution to the scattering intensity as a result of scattering at an ensemble of defects is found as well, which is characteristic of manganese-rich samples. This contribution is well fitted by the power function Q–n with the exponent n = 3. The complementary scattering typical of iron-rich samples is described by an exponential function and also seems to be a part of scattering at sharp-boundary crystallites.

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ACKNOWLEDGMENTS

We are grateful to B. Wu and A. Heinemann, responsible for the KWS-3 and SANS-1 neutron stations, for help in taking the measurements.

Funding

This work was supported by the Russian Science Foundation, project no. 17-12-01050.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”, 188300, Gatchina, Russia

    E. G. Iashina, E. V. Altynbaev & S. V. Grigoriev

  2. St. Petersburg State University, 199034, St. Petersburg, Russia

    E. G. Iashina, E. V. Altynbaev & S. V. Grigoriev

  3. Institute for High Pressure Physics, Russian Academy of Sciences, 142190, Troitsk, Russia

    E. G. Iashina, E. V. Altynbaev, L. N. Fomicheva, A. V. Tsvyashchenko & S. V. Grigoriev

Authors
  1. E. G. Iashina
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  2. E. V. Altynbaev
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  3. L. N. Fomicheva
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  4. A. V. Tsvyashchenko
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  5. S. V. Grigoriev
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Corresponding author

Correspondence to E. G. Iashina.

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Translated by O. Maslova

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Iashina, E.G., Altynbaev, E.V., Fomicheva, L.N. et al. On the Nature of Defects in Mn1 –xFexGe Compounds Synthesized under High Pressure. J. Surf. Investig. 14, 429–433 (2020). https://doi.org/10.1134/S1027451020030209

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  • DOI: https://doi.org/10.1134/S1027451020030209

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