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<p>The results of a&#xa0;study focused on the separation of contributions into the increasing the radiation resistance of the micro powders modified with micro- and nanoparticles of oxide compounds with the rare earth cations are reported. It is found out that the relaxation of primary defects formed by irradiation occurs in two pathways: relaxation on nanoparticles—crystal lattice structure defects of the CaSiO<sub>3</sub> micropowder, and relaxation on the cerium dioxide cations, the rare earth elements with an incomplete f‑shell. The former mechanism provides a&#xa0;larger contribution into the radiation resistance: it decreases the concentration of the irradiation-induced primary radiation defects on nanoparticles, as on the small-sized defects in the micro powder crystal structure. The relationship is fulfilled in a&#xa0;wide range of the fluences of the electrons with the energy of 30 keV (<i>F</i> = (1–7) ∙10<sup>16</sup> cm<sup>−2</sup>). Similar relationships were determined earlier for the ZnO powder modified with Gd<sub>2</sub>O<sub>3</sub> micro- and nanoparticles.</p>

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Comparison of contributions from different mechanisms of increasing the radiation resistance of CaSiO3 powders modified with CeO2 micro- and nanoparticles

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. M. Mikhailov,
  • A. N. Lapin,
  • S. A. Yuryev,
  • V. A. Goronchko,
  • D. S. Fedosov

摘要

The results of a study focused on the separation of contributions into the increasing the radiation resistance of the micro powders modified with micro- and nanoparticles of oxide compounds with the rare earth cations are reported. It is found out that the relaxation of primary defects formed by irradiation occurs in two pathways: relaxation on nanoparticles—crystal lattice structure defects of the CaSiO3 micropowder, and relaxation on the cerium dioxide cations, the rare earth elements with an incomplete f‑shell. The former mechanism provides a larger contribution into the radiation resistance: it decreases the concentration of the irradiation-induced primary radiation defects on nanoparticles, as on the small-sized defects in the micro powder crystal structure. The relationship is fulfilled in a wide range of the fluences of the electrons with the energy of 30 keV (F = (1–7) ∙1016 cm−2). Similar relationships were determined earlier for the ZnO powder modified with Gd2O3 micro- and nanoparticles.