Release behavior of water vapor and mass loss from lithium titanate

Katayama, Kazunari; Kashimura, Hideaki; Hoshino, Tsuyoshi; Nishikawa, Masabumi; Yamasaki, Hideo; Ishikawa, Shinichiro; Ohnishi, Yasuhito; Fukada, Satoshi

doi:10.1016/j.fusengdes.2012.02.050

Cited by 18 publications

(3 citation statements)

References 11 publications

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“…Finally, the amount of chemical absorbed water and generated water per unit surface area for various ceramic breeder materials are shown in Fig. 5 [21,22,[26][27][28]. It can be seen from Fig.…”

Section: (B) and (D))mentioning

confidence: 97%

“…Due to the release of physically adsorbed water and chemically adsorbed water, as well as the reaction between O in the ceramic and H in the purge gas, the presence of water vapor under operating conditions cannot be ignored [21]. Many studies have shown that the presence of water vapor will have a dramatic effect on the form of tritium release, since tritium can be easily transferred into water vapor through isotopic exchange reactions [22]. Furthermore, it has been demonstrated that the Li mass loss of breeding materials will be more severe in water vapor than in H 2 atmosphere [23].…”

Section: Introductionmentioning

confidence: 99%

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Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Chen

Katayama

et al. 2021

Preprint

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The development of novel tritium breeding materials was urgently needed in order to continuously optimize the tritium breeding ratio (TBR) of thermonuclear fusion reactors. From this point of view, Li4TiO4-Li2TiO3 core-shell breeding materials with more reasonable structure and theoretical Li density of 0.464 g/cm3 were prepared in this work. Notably, the mass transfer experiment at 900 °C in 1% H2/Ar shows that the theoretical Li density of this core-shell material after heating for 30 days was significantly higher than that of other breeding materials, indicating that it can provide more stable and efficient TBR. Specifically, the Li mass loss of the sample after 30 days heating was 3.4%, resulting in a decrease of Li density to 0.415 g/cm3. The mechanism of Li mass loss in Li4TiO4-Li2TiO3 core-shell breeding materials was investigated in detail. Moreover, the samples did not crack or collapse during the long-term heating process, and always maintained a satisfactory crushing load, revealing that this core-shell breeding ceramic can be used for a long time under severe operating conditions.

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Section: (B) and (D))mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Chen

Katayama

et al. 2021

Preprint

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“…around 1100 K to avoid lithium evaporation [8]. Indeed, the relative density of pebbles, which is defined as the ratio of an actual pebble density to a theoretical pebble density, was usually 70 ∼ 90 %.…”

Section: Introductionmentioning

confidence: 99%

Development of the Tritium Transport Model for Pebbles of Li<sub>2</sub>TiO<sub>3</sub>

Kobayashi

Oya

2018

Plasma and Fusion Research

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Tritium transport code in Li 2 TiO 3 pebbles were developed in this study. In the simulation code, tritium transports in a grain, a closed-pore and an opened-pore were modeled and combined. The tritium transport in grain was modeled by the tritium diffusion, trapping/detrapping by defects, and the annihilation process of defects. The adsorption/desorption equilibrium of diffusing tritium gas molecule was modeled for the tritium transports in opened-pores. A vacant-core and shell model was used to model the tritium transport in closedpores. The results by simulation code suggested that the tritium trapping by closed-pores would result in the shift of tritium release toward higher temperature side as dissociation of tritium gas molecule in closed-pores requires higher activation energy.

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Recovery of Tritium Bred in Blanket

Katayama

Nishikawa

2016

Tritium: Fuel of Fusion Reactors

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Release behavior of water vapor and mass loss from lithium titanate

Cited by 18 publications

References 11 publications

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Mass Transfer Behavior and Microstructure Evolution of Li4TiO4-Li2TiO3 Core-shell Breeding Ceramic Under Harsh Operating Conditions

Development of the Tritium Transport Model for Pebbles of Li<sub>2</sub>TiO<sub>3</sub>

Recovery of Tritium Bred in Blanket

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