Tritium release behavior of Li2TiO3 and 2Li2TiO3-Li4SiO4 biphasic ceramic pebbles fabricated by microwave sintering

Yang, Ming‐Bo; Zhao, Linjie; Ran, Guangming; Gong, Yu; Wang, Heyi; Peng, Shuming; Xiao, Chengjian; Chen, Xiaojun; Lu, Tiecheng

doi:10.1016/j.fusengdes.2021.112390

Cited by 25 publications

(10 citation statements)

References 29 publications

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“…Thus, summarizing all of the above, we can conclude that the formation of twophase LiTiO 2 -Li 2 TiO 3 ceramics with a cubic phase content of no more than 10-20% can significantly increase both the strength properties of ceramics and increase the resistance to degradation and corrosion, as well as reduce the oxidation and destruction rate of ceramics. The results obtained are also in good agreement with other works [9][10][11][12][13][14] devoted to studying the effect of two phases on the stability of lithium-containing ceramics and increasing the efficiency of their productivity.…”

Section: Resultssupporting

confidence: 90%

“…One of the most promising materials for such reactions are lithium-containing ceramics such as Li 2 TiO 3 , Li 4 SiO 4 , Li 2 ZrO 3 , etc., which not only have good mechanical properties, but also contain a large amount of lithium [4][5][6]. At the same time, it was shown in a number of works that the presence of two-phase ceramics of Li 2 TiO 3 -Li 4 SiO 4 or LiTiO 2 -Li 2 TiO 3 type leads not only to an increase in the strength of the ceramics, but also significantly affects the yield of tritium and its resistance to radiation damage arising during the accumulation of lithium [7][8][9][10]. The presence of a "core-shell" structure in such ceramics opens up wide possibilities for the production of tritium, as well as for high mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

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Study of Corrosion Resistance and Degradation Mechanisms in LiTiO2-Li2TiO3 Ceramic

2021

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The interest in lithium-containing ceramics is due to their huge potential as blanket materials for thermonuclear reactors for the accumulation of tritium. However, an important factor in their use is the preservation of the stability of their strength and structural properties when under the influence of external factors that determine the time frame of their operation. This paper presents the results of a study that investigated the influence of the LiTiO2 phase on the increasing resistance to degradation and corrosion of Li2TiO3 ceramic when exposed to aggressive acidic media. Using the X-ray diffraction method, it was found that an increase in the concentration of LiClO4·3H2O during synthesis leads to the formation of a cubic LiTiO2 phase in the structure as a result of thermal sintering of the samples. During corrosion tests, it was found that the presence of the LiTiO2 phase leads to a decrease in the degradation rate in acidic media by 20–70%, depending on the concentration of the phase. At the same time, and in contrast to the samples of Li2TiO3 ceramics, for which the mechanisms of degradation during a long stay in aggressive media are accompanied by large mass losses, for the samples containing the LiTiO2 phase, the main degradation mechanism is pitting corrosion with the formation of pitting inclusions.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Study of Corrosion Resistance and Degradation Mechanisms in LiTiO2-Li2TiO3 Ceramic

2021

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“…At the same time, the presence of two or more phases in the structure of ceramics can lead to the fact that the processes of radiation damage will be restrained by interfacial boundaries or a dislocation structure [18,19]. Such hypotheses were put forward in a number of works [20][21][22][23] devoted to the study of the properties of two-three-phase lithium-containing ceramics, according to which the presence of several phases in the structure affects not only the strengthening of ceramics but also their productivity in terms of helium yield, due to the acceleration of reactions with lithium [24,25].…”

Section: Introductionmentioning

confidence: 99%

Study of Radiation Resistance to Helium Swelling of Li2ZrO3/LiO and Li2ZrO3 Ceramics

et al. 2022

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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.

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“…Lithium-containing ceramics are chosen as the main material for breeding tritium due to the possibility of nuclear reactions occurring in them with the subsequent formation of tritium, and because of the high concentration of lithium in nature, which would solve the issue of tritium production for the next few decades. As a rule, structures of the Li 2 TiO 3 , Li 2 SiO 3 , and Li 2 ZrO 3 types are chosen as lithium-containing ceramics; these structures have a combination of physicochemical and structural properties that make it possible to use them for tritium production [6][7][8][9][10]. At the same time, one of the key requirements for lithium-containing ceramics based on titanates and silicates is an increased resistance to mechanical and radiation damage in the case of their operation in the production of tritium [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis, Properties, and Stability of Lithium-Containing Nanostructured Nickel-Doped Ceramics

Kozlovskiy

Zdorovets

Khametova

et al. 2022

Gels

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Lithium-containing ceramics have several great potential uses for tritium production, as well as its accumulation. However, their use is limited due to their poor resistance to external influences, mechanical pressure, and temperature changes. In this work, initial nanostructured ceramic powders were obtained using the sol-gel method, by mixing TiO2 and LiClO4·3H2O with the subsequent addition of NiO nanoparticles to the reaction mixture; these powders were subsequently subjected to thermal annealing at a temperature of 1000 °C for 10 h. Thermal annealing was used to initiate the phase transformation processes, and to remove structural distortions resulting from synthesis. During the study, it was found that the addition of NiO nanoparticles leads to the formation of solid solutions by a type of Li0.94Ni1.04Ti2.67O7 substitution, which leads to an increase in the crystallinity and structural ordering degree. At the same time, the grain sizes of the synthesized ceramics change their shape from rhomboid to spherical. During analysis of the strength characteristics, it was found that the formation of Li0.94Ni1.04Ti2.67O7 in the structure leads to an increase in hardness and crack resistance; this change is associated with dislocation. When analyzing changes in resistance to cracking, it was found that, during the formation of the Li0.94Ni1.04Ti2.67O7 phase in the structure and the subsequent displacement of the Li2TiO3 phase from the composition, the crack resistance increases by 15% and 37%, respectively, which indicates an increase in the resistance of ceramics to cracking and the formation of microcracks under external influences. This hardening and the reinforcing effect are associated with the replacement of lithium ions by nickel ions in the crystal lattice structure.

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Tritium release behavior of Li2TiO3 and 2Li2TiO3-Li4SiO4 biphasic ceramic pebbles fabricated by microwave sintering

Cited by 25 publications

References 29 publications

Study of Corrosion Resistance and Degradation Mechanisms in LiTiO2-Li2TiO3 Ceramic

Study of Corrosion Resistance and Degradation Mechanisms in LiTiO2-Li2TiO3 Ceramic

Study of Radiation Resistance to Helium Swelling of Li2ZrO3/LiO and Li2ZrO3 Ceramics

The Synthesis, Properties, and Stability of Lithium-Containing Nanostructured Nickel-Doped Ceramics

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