Tritium release behavior of Li4SiO4 pebbles with high densities and large grain sizes

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

“…The porous areas marked in Figure 5 by points 3-5, according to the elemental analysis data, contained a higher oxygen content of 80-82%, which indicates that degradation occurs due to the formation of porous inclusions containing a high oxygen concentration. When ceramics react with a solution of sulfuric acid, the following chemical reactions (1)(2)(3)(4)(5)(6)(7)(8) analysis shows, no titanium oxides were detected on the samples, thus most likely only 20% sulfuric acid is not sufficient for 4,5 reactions to take place in the case of Li2TiO3 and reaction 8 in the case of LiTiO2. Thus, etching occurs, followed by destruction of the particles under the influence of acid.…”

“…The most energetically advantageous nuclear reaction for lithium accumulation is 6 Li+n→ 4 He+T+4. 8 MeV reaction, which allows not only the obtaining of tritium, but also the generation of a large amount of energy [1][2][3]. 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].…”

“…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.…”

Fabrication of submicron Li‐rich Li2(Ti,Zr)O3 solid solution ceramics with sluggish grain growth rate

“…Meanwhile, after the tritium is generated in the grains, the produced tritium must escape the ceramics as soon as possible to be extracted for use in the fuel cycle. Microstructures are crucial parameters that control the tritium release performance, and a uniform microstructure with small grain size is required for accelerating the tritium release rate, which has been confirmed by many out‐of‐pile tritium annealing studies 11–13 …”

“…Microstructures are crucial parameters that control the tritium release performance, and a uniform microstructure with small grain size is required for accelerating the tritium release rate, which has been confirmed by many out-of-pile tritium annealing studies. [11][12][13] Modification of Li 2 TiO 3 to increase the Li density and control the grain growth during sintering has attracted considerable attention in recent years. [14][15][16][17][18][19] As Li 2 TiO 3 has a broad stoichiometric range with Li/Ti ratios varying from 1.88 to 2.25, 20 Hoshino et al developed the singlephase Li-doped Li 2 TiO 3 as an advanced tritium breeder and found that not only the Li density is increased but also the chemical stability under operating conditions is enhanced.…”