Chemical form of tritium released from solid breeder materials

Nishikawa, Masabumi; Kinjyo, T.; Nishida, Y.

doi:10.1016/j.jnucmat.2003.11.001

Cited by 48 publications

(16 citation statements)

References 11 publications

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“…However, the possibility of water formation reaction should be taken into account. It is known that water is formed when hydrogen flow through the packed bed of lithium ceramics at elevated temperature [5,12,13]. The water formation reaction is expressed roughly as;…”

Section: Purge By Dry Hementioning

confidence: 99%

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Effect of sweep gas species on tritium release behavior from lithium titanate packed bed during 14 MeV neutron irradiation

Kawamura

Ochiai

Hoshino

et al. 2012

Fusion Engineering and Design

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Section: Purge By Dry Hementioning

confidence: 99%

“…Hence, its analysis becomes difficult. The post-irradiation experiments also have been often carried out so far [5][6][7]. It was useful for investigation of the amount of tritium generated and the thermal desorption behavior of tritium.…”

Section: Introductionmentioning

confidence: 99%

Effect of sweep gas species on tritium release behavior from lithium titanate packed bed during 14 MeV neutron irradiation

Kawamura

Ochiai

Hoshino

et al. 2012

Fusion Engineering and Design

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“…[6][7][8] The lithium based ceramics, such as Li 2 SiO 4 , have been considered as the favorable candidates of tritium breeders in helium cooled solid pebble bed (HCSPB) design. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] Specially, the lithium orthosilicate (Li 4 SiO 4 ) have the attractive natural characters of high melting temperature, high lithium density, compatibility with the structure materials, tritium release performance and so forth. China and Europe have chosen Li 4 SiO 4 as the first candidate in their tritium breeding test blanket modules (TBMs) designs.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory calculations of point defects and hydrogen isotopes in Li4SiO4

Xiang

Zhu

et al. 2015

AIP Advances

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The Li 4 SiO 4 is a promising breeder material for future fusion reactors. Radiation induced vacancies and hydrogen isotope related impurities are the major types of point defects in this breeder material. In present study, various kinds of vacancies and hydrogen isotopes related point defects in Li 4 SiO 4 are investigated through density functional theory (DFT) calculations. The band gap of Li 4 SiO 4 is determined by UVVis diffuse reflectance spectroscopy experiments. Formation energies of all possible charge states of Li, Si and O vacancies are calculated using DFT methods. Formation energies of possible charge states of hydrogen isotopes substitution for Li and O are also calculated. We found that Li-vacancies will dominate among all vacancies in neutral charge state under radiation conditions and the O, Li, and Si vacancies (V O ,V Li ,V Si ) are stable in charge states +2, -1, -4 for most of the range of Fermi level, respectively. The interstitial hydrogen isotopes (H i ) and substitutional H Li are stable in the charge states +1, 0 for most of the range of Fermi level, respectively. Moreover, substitutional H O are stable in +1 charge states. We also investigated the process of tritium recovery by discussing the interaction between interstitial H and Li-vacancy, O-vacancy, and found that H + O and H 0 Li are the most common H related defects during radiation process. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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“…Since the water formation reaction occurs between ceramic breeder materials and hydrogen at high temperature, the behavior of the generated water becomes more important in DEMO blanket condition. It has been reported that Li 2 TiO 3 has the largest water formation capacity among ceramic breeder materials [1]. The oxygen loss in hydrogen atmosphere causes the structural change of Li 2 TiO 3 [2,3].…”

Section: Introductionmentioning

confidence: 99%