Abstract
The article is dedicated to the study of the phase formation processes in Li2ZrO3 ceramics obtained by the method of solid phase synthesis. Interest in these types of ceramics is due to their great potential for use as blanket materials in thermonuclear reactors, as well as being one of the candidates for tritium breeder materials. Analysis of the morphological features of the synthesized ceramics depending on the annealing temperature showed that the average grain size is 90–110 nm; meanwhile the degree of homogeneity is more than 90% according to electronic image data processing results. The temperature dependences of changes in the structural and conducting characteristics, as well as the phase transformation dynamics, have been established. It has been determined that a change in the phase composition by displacing the impurity LiO and ZrO2 phases results in the compaction of ceramics, as well as a decrease in their porosity. These structural changes are due to the displacement of LiO and ZrO2 impurity phases from the ceramic structure and their transformation into the Li2ZrO3 phase. During research, the following phase transformations that directly depend on the annealing temperature were established: LiO/ZrO2/Li2ZrO3 → LiO/Li2ZrO3 → Li2ZrO3. During analysis of the obtained current-voltage characteristics, depending on the annealing temperature, it was discovered that the formation of the Li2ZrO3 ordered phase in the structure results in a rise in resistance by three orders of magnitude, which indicates the dielectric nature of the ceramics.
Highlights
In the light of global trends in energy development and the search for alternative sources of energy in order to decarbonize the energy sector and the economies of developed countries, more and more attention has been paid to nuclear energy
In view of the aforementioned, the objective of this paper is to examine the phase transformation processes in Li2 ZrO3 ceramics depending on the sintering temperature, and the effect of impurity inclusions on the properties of ceramics
The general view of the obtained diffraction patceramics are large of various shapes in the reference condition and a detailed terns indicates theagglomerates polycrystalline structure of ceramics, and the dynamics of the change analysis revealed that they consist ofupon spherical grains, thetemperature size of which varies from in shape of ofthem the diffraction lines depending the annealing characterizes to 230 nm
Summary
In the light of global trends in energy development and the search for alternative sources of energy in order to decarbonize the energy sector and the economies of developed countries, more and more attention has been paid to nuclear energy. A great amount of attention in this field is primarily related to the possibility of obtaining a large amount of energy, which can be used to meet the needs of large cities and enterprises, and to produce hydrogen, which will be an alternative energy source in the near future [1,2,3]. The processes associated with tritium accumulation are based on its production and accumulation in the blanket material, followed by absorption and desorption of the obtained tritium from the blanket [4,5]. The most common method for producing tritium is nuclear reaction under the influence of thermal neutrons 6 Li + n → 4 He + T + 4, 8 MeV, which allow the production of tritium, and its accumulation [6].
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