Tritium migration in the materials proposed for fusion reactors: Li2TiO3 and beryllium

Kulsartov, T.; Gordienko, Yuriy; Tazhibayeva, I.; Kenzhin, E.A.; Barsukov, Nikolay; Sadvakasova, A.O.; Kulsartova, A.V.; Zaurbekova, Zhanna

doi:10.1016/j.jnucmat.2013.03.036

Cited by 27 publications

(16 citation statements)

References 11 publications

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“…As stated in Sec. I, the tritium diffusion barriers estimated from experiments have a considerable uncertainty in the range of 0.4 to 1.6 eV [11][12][13][14][15][16][17], which is reasonably consistent with our above DFT values, considering the various Li 2 TiO 3 samples with different grain sizes, grain densities, grain orientations, defects, etc. in these experiments versus the perfect single Li 2 TiO 3 crystal in this work.…”

Section: Long-range Global Anisotropic Diffusion Barrierssupporting

confidence: 87%

“…The detrapping process from irradiation defects is also found to play a part in the diffusion mechanism, and the activation energy for detrapping is notably higher [11]. From a series of studies of tritium release in Li 2 TiO 3 , the activation energy of tritium diffusion is estimated to be in the range of 0.4 to 1.6 eV with a considerable uncertainty under different temperatures and in various Li 2 TiO 3 samples [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

Shi

Han

et al. 2018

Phys. Rev. Applied

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Tritium diffusion in the nuclear fusion reactor breeder material Li 2 TiO 3 is a fundamentally important process for the tritium release kinetics. The energy barrier of tritium diffusion in Li 2 TiO 3 was reported with a considerable uncertainty in previous experiments. Here, we perform the systematic density-functional-theory (DFT) studies for the diffusion processes of a positively-charged tritium, which is the most preferable charge state of the tritium interstitial in a single Li 2 TiO 3 crystal. By calculating various local-diffusion minimum-energy paths, we find that the diffusion of the tritium is strongly anisotropic along different crystalline directions. The most favorable diffusion paths appear within a Li 6 atomic single layer of Li 2 TiO 3 and the corresponding DFT diffusion barrier is 0.334 eV, while the diffusion barrier for most favorable diffusion paths crossing a Li 2 Ti 4 atomic layer is 1.006 eV.

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Section: Long-range Global Anisotropic Diffusion Barrierssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

Shi

Han

et al. 2018

Phys. Rev. Applied

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“…On the other hand, lithium metatitanate (Li 2 TiO 3 ) is originally applied as a promising solid breeder material in fusion reactors and ionic conductors in the form of blankets due to its good thermal stability and fast tritium release capacity . And Li ion diffusion is found to have much significance on the performance in the material, which is prone to occur in environments containing oxygen vacancies and Ti 3+ and diffuse along the grain boundary .…”

Section: Introductionmentioning

confidence: 99%

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

et al. 2018

J Am Ceram Soc

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In order to solve the problems of acceptor/donor individual doping in Li2TiO3 system and clarify the superiority mechanism of co‐doping for improving the Q value, Mg + Nb co‐doped Li2TiO3 have been designed and sintered at a medium temperature of 1260°C. The effects of each Mg/Nb ion on structure, morphology, grain‐boundary resistance and microwave dielectric properties are investigated. The substitution of (Mg1/3Nb2/3)4+ inhibits not only the diffusion of Li+ and reduction in Ti4+, but also the formation of microcracks in ceramics, which promotes the enhancement of Q value. The experiments reveal that Q × f value of Li2TiO3 ceramics co‐doped with magnesium and niobium is 113 774 GHz (at 8.573 GHz), which is increased by 113% compared with the pure Li2TiO3 ceramics. And the co‐doped ceramics have an appropriate dielectric constant of 19.01 and a near‐zero resonance frequency temperature coefficient of 13.38 ppm/°C. These results offer a scientific basis for co‐doping in Li2TiO3 system, and the outstanding performance of (Mg + Nb) co‐doped ceramics provides a solid foundation for widespread applications of microwave substrates, resonators, filters and patch antennas in modern wireless communication equipments.

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“…solid tritium breeding materials. However, the experimental results are scattered, especially for diffusivities [2][3][4][5][6]. It can be said that the comprehensive model of tritium release kinetics is still not determined.…”

Section: Introductionmentioning

confidence: 99%

Release behavior of hydrogen isotopes in deuterium-irradiated Li2TiO3

Wang

Feng

et al. 2016

Fusion Engineering and Design

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Tritium migration in the materials proposed for fusion reactors: Li2TiO3 and beryllium

Cited by 27 publications

References 11 publications

Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium

Release behavior of hydrogen isotopes in deuterium-irradiated Li2TiO3

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Tritium migration in the materials proposed for fusion reactors: Li2TiO3 and beryllium

Cited by 27 publications

References 11 publications

Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

Anisotropic Diffusion of a Charged Tritium Interstitial in Li2TiO3 from First-Principles Calculations

High‐Q microwave ceramics of Li2TiO3 co‐doped with magnesium and niobium

Release behavior of hydrogen isotopes in deuterium-irradiated Li2TiO3

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Product

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High‐Q microwave ceramics of Li₂TiO₃ co‐doped with magnesium and niobium