Abstract
The key aim of this paper is to study the presence effect of LiO impurity phases in Li2ZrO3 ceramics on the resistance to helium swelling and structural degradation during implanted helium accumulation in the near-surface layer structure. The hypothesis put forward is based on a number of scientific papers, in which it was reported that the presence of two or more phases in lithium-containing ceramics led to a decrease in the rate of radiation damage and gas swelling due to the presence of additional interfacial boundaries that prevent the point defect accumulation. As a result of the evaluation of the crystal structure deformation, it was found that the presence of the LiO impurity phase in the structure of Li2ZrO3 ceramics led to a threefold decrease in the deformation of the crystal lattice due to helium swelling at doses of 5 × 1017–5 × 1018 ion/cm2. At the same time, the nature of the crystal lattice deformation for different ceramic types is different: in the case of Li2ZrO3 ceramics, an anisotropic distortion of the crystal structure is observed, in the case of Li2ZrO3/LiO ceramics, the crystal lattice deformation has an isotropic nature.
Highlights
Academic Editor: Shujun ZhangTo date, one of the promising areas of research in the field of search and creation of alternative energy sources is nuclear power, in particular, the development of new types of high-temperature reactors of a new generation that are capable of operating much longer than classical reactors
ZrO33monomonoclinic phase depending on the irradiation dose (displacement values are presented on a logarithmic clinic phase depending on the irradiation dose: (a) Li2ZrO3/LiO ceramics; (b) Li2ZrO3 ceramics
An important factor in assessing the applicability of ceramics as structural materials for nuclear reactors, as well as their use for breeding tritium, is the long-term preservation of the thermal conductivity of ceramics, which depends on many factors, including radiation damage and swelling
Summary
Academic Editor: Shujun ZhangTo date, one of the promising areas of research in the field of search and creation of alternative energy sources is nuclear power, in particular, the development of new types of high-temperature reactors of a new generation that are capable of operating much longer than classical reactors. An important role in the development of nuclear energy is given to the search for new materials that, during their operation, will allow the production of additional fuel, such as tritium or hydrogen [1–3]. One of the ways to develop this area of research is the development related to the study of methods for obtaining lithiumcontaining ceramics, which have great prospects for the safe production of tritium and hydrogen, which is planned to be used in the future to create thermonuclear installations, as well as the transition to new types of nuclear fuel [4,5]. Due to its high mobility and low solubility, helium can agglomerate by forming He-V vacancies or fill voids in ceramics, thereby forming gas-filled bubbles leading to material destruction [8–10].
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