Thermophysical Properties of Mixtures of Thorium and Uranium Nitride

Parker, Stephen S.; Newman, Sara; Fallgren, Andrew James; White, Joshua T.

doi:10.1007/s11837-021-04844-2

Cited by 7 publications

(15 citation statements)

References 17 publications

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“…Uranium carbide is considered as a promising material for fuel of fast nuclear reactors due to its unique properties [2]. Actinide nitrides are of interest as the fuel of nuclear power plants, since nitrides have a higher thermal conductivity compared to actinide oxides, which reduces the thermal degradation of reactors [3]. For these nuclear materials, the problem of describing their thermal conductivity has not yet been solved.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Carbides and Nitrides of Zr, Th and U: Numerical Approach

Kizka¹

2023

Preprint

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Using number theory, a formula is obtained that describes the thermal conductivities of ZrC, UC, UN, ThN, ZrN and ThxU1-xN at x = 0.2 and 0.5 with temperature change. This formula contains the atomic numbers of the elements, the thermal conductivities of the individual elements of the substance, and the structural parameter. There is no direct dependence on temperature in the formula, since it is hidden in the thermal conductivities of each element and in the structure parameter. In some temperature ranges, the structural parameter is constant; therefore, the thermal conductivity of some carbides and nitrides is expressed through summing the thermal conductivities of individual elements.

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Carbides and Nitrides of Zr, Th and U: Numerical Approach

Kizka¹

2023

Preprint

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“…It is here where photothermal approaches offer a viable option for studying samples with small physical dimensions without damage to the sample or the need for destructive sample preparation approaches [95]. Several comprehensive reviews have been recently published on the thermophysical properties of actinide oxides [4], nitrides [96], and carbides [97,98] due to the importance of these compounds to nuclear science and industry.…”

Section: B Characterization Of Thin Filmsmentioning

confidence: 99%

“…Thermal conductivities have been measured for ThO 2 [141], UO 2 [142], NpO 2 [143], and PuO 2 [144]. The heat capacities of select actinide nitride systems have been measured, including ThN [145], and more recently for the UN-ThN mixtures used in nuclear fuels [96]. Among these properties, thermal diffusivity and conductivity have been recently studied as important factors in determining the properties of a nuclear fuel candidate material [4].…”

Section: Thermophysical Magnetic and Topological Properties Of Actini...mentioning

confidence: 99%

Advances in actinide thin films: synthesis, properties, and future directions

Vallejo¹,

Kabir²,

Poudel³

et al. 2022

Preprint

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Actinide-based compounds exhibit unique physics due to the presence of 5f electrons, and serve in many cases as important technological materials. Targeted thin film synthesis of actinide materials has been successful in generating high-purity specimens in which to study individual physical phenomena. These films have enabled the study of the unique electron configuration, strong mass renormalization, and nuclear decay in actinide metals and compounds. The growth of these films, as well as their thermophysical, magnetic, and topological properties, have been studied in a range of chemistries, albeit far fewer than most classes of thin film systems. This relative scarcity is the result of limited source material availability and safety constraints associated with the handling of radioactive materials. Here, we review recent work on the synthesis and characterization of actinide-based thin films in detail, describing both synthesis methods and modelling techniques for these materials. We review reports on pyrometallurgical, solution-based, and vapor deposition methods. We highlight the current state-of-the-art in order to construct a path forward to higher quality actinide thin films and heterostructure devices.

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“…The commercialization of molten salt reactor (MSR) technology based on a thorium cycle is on the fast track in China, with a 2 MW experimental reactor currently being tested [ 10 ]. Thorium nitride is under development as a fuel component for compact nuclear reactors, including space reactors [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Thorium and Rare Earth Monoxides and Related Phases

et al. 2023

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Thorium was a part of energy infrastructure in the 19th century due to the refractory and electronic properties of its dioxide. It will be a part of future energy infrastructure as the most abundant energy reserve based on nuclear fission. This paper discusses the solid-state chemistry of the monoxides and related rocksalt phases of thorium and the rare earths, both at atmospheric and at high pressure. The existence of solid thorium monoxide was first suggested more than 100 years ago; however, it was never obtained in bulk and has been studied mostly theoretically. Monoxides of lanthanides from Eu to Ho are ferromagnetic semiconductors sought for spintronics and were studied in thin films. La to Sm metallic monoxides were synthesized in bulk at pressures below 5 GPa. Recently, ThO formation in thin films has been reported and the stability of bulk ThO at high pressure was theoretically predicted based on first principles computations at 0 K. New ab initio computations were performed accounting for temperature effects up to 1000 K using lattice dynamics in the quasi-harmonic approximation. New computational results confirm the stabilization of pure ThO above 30 GPa and suggest the possibility of high-pressure synthesis of (Th,Nd)O at 1000 K and 5 GPa.

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Thermophysical Properties of Mixtures of Thorium and Uranium Nitride

Cited by 7 publications

References 17 publications

Thermal Conductivity of Carbides and Nitrides of Zr, Th and U: Numerical Approach

Thermal Conductivity of Carbides and Nitrides of Zr, Th and U: Numerical Approach

Advances in actinide thin films: synthesis, properties, and future directions

Thorium and Rare Earth Monoxides and Related Phases

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