Hydrogen absorption in uranium-based alloys with cubic γ -U structure

Havela, L.; Kim-Ngan, N.-T.H.

doi:10.1088/2043-6254/aa594f

Cited by 2 publications

(3 citation statements)

References 19 publications

(34 reference statements)

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“…They can absorb a large amount of hydrogen but only upon applying hydrogen pressure higher than 2.5 bars. The formed hydrides (UH 3 ) 1−x T x are ferromagnets with the Curie temperature reaching 200 K [11,12]. The crucial point is that the hydrides formed from the γ-U alloys are very stable in ambient conditions and in particular they are non-pyrophoric.…”

Section: Introductionmentioning

confidence: 99%

Superconducting phase transitions in the milikelvin temperature range in splat-cooled U-Pt alloys

Chrobak

Tarnawski

Sowa

et al. 2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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We present the temperature and magnetic-field dependence of electrical resistivity (ρ(T, B) dependence) in the milikelvin range for U-Pt alloys with Pt concentration in the range of 0–15 atomic percent (at.%) prepared by splat-cooling technique. The high-temperature cubic γ-U phase can be stabilized down to room temperature in the samples with 15 at.% Pt. All samples exhibit superconducting transitions below 1.1 K revealed by abrupt resistivity drops with transition widths of several tens of milikelvins in zero magnetic field. The H–T diagrams for all investigated alloys are in good agreement with the Ginzburg-Landau approximation. The U-Pt alloys with cubic γ-U phase are very stable in air and hydrogen exposure at atmospheric conditions. They can absorb a large amount of hydrogen upon applying hydrogen pressure >2.5 bars and easily release it by heating in vacuum, showing the possibility of using U-Pt-based hydrides as a medium for hydrogen storage.

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Section: Introductionmentioning

confidence: 99%

Superconducting phase transitions in the milikelvin temperature range in splat-cooled U-Pt alloys

Chrobak

Tarnawski

Sowa

et al. 2017

Adv. Nat. Sci: Nanosci. Nanotechnol.

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“…Inicialmente, a hidretação de urânio metálico foi estudada para análise de corrosão do metal e posteriormente para a estocagem de trítio em instalações nucleares devido a sua alta taxa de absorção de hidrogênio. Atualmente, além de ser intermediário na formação de vários compostos de urânio, o hidreto de urânio é visto como um futuro combustível para reatores nucleares modulares [34,35] [16,29,37,38].…”

Section: Hidretação Moagem E Desidretaçãounclassified

“…O início do processo com temperaturas mais elevadas se deve à ativação do metal. A reação, por ser exotérmica, tem uma taxa de absorção de hidrogênio maior durante o resfriamento do sistema[25,27,34,37,38,43,44,45,46,47,48,49].Para se obter o pó na granulometria desejada, também é estudado variar o número de ciclos de hidretação antes da moagem. Foi observado que quanto maior o número de ciclos consecutivos, maior a quantidade de hidrogênio absorvido por grama de metal.Estudos mostram a absorção máxima de hidrogênio sendo atingida entre 8 a 10 ciclos[48,49].…”

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Estudo do processo de fabricação de placas combustíveis com uma dispersão a base de gama U7Mo

Pires¹

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The search for new materials for nuclear fuels has been developed over the last 50 years, with the main aim of increasing the fuel efficiency during the operation of the reactors. The need to increase the uranium density in fuels to compensate the reduction of enrichment proposes that the U-Mo alloy is one of the materials that presents better characteristics to be used as fuel: molybdenum is a material that retains the gamma phase of the uranium in low concentrations, which is the only stable phase of uranium under the irradiation conditions, besides having low thermal neutron absorption. Although more advanced studies already provide information on the interaction between UMo and the Al matrix, we still need to study how this material behaves during all processing steps for fuel fabrication. The present work has the objective of to deepen the technological knowledge about the stages of production of dispersion type nuclear fuel, including the comminution process of the UMo alloy. The alloy pulverization made by the hydriding-grinding-dehydriding technique still reveals a large number of unknowns in the process variables. Knowing some parameters already existent in the literature, it is possible to discuss the behavior of the hydriding process and envision improvements to optimize it as well as make it reproducible. Subsequent manufacturing steps for briquette and rolling were performed according to IPEN's expertise and the results indicate that the U-Mo alloy, though being mechanically doable, it is necessary adjust the actual fabrication process to the new mechanical alloy properties and to avoid the oxidation of the core of fuel plate.

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Hydrogen absorption in uranium-based alloys with cubic γ -U structure

Cited by 2 publications

References 19 publications

Superconducting phase transitions in the milikelvin temperature range in splat-cooled U-Pt alloys

Superconducting phase transitions in the milikelvin temperature range in splat-cooled U-Pt alloys

Estudo do processo de fabricação de placas combustíveis com uma dispersão a base de gama U7Mo

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