Production of films of uranium and americium compounds by thermal decomposition of volatile β-diketonates

Danilin, I.D; Kartushin, V.D; Pilipenko, N.V; Abramycheva, I.D; Vesnovskii, S. P.

doi:10.1016/s0168-9002(01)02057-5

Cited by 4 publications

(3 citation statements)

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“…The crucible is then heated with DC filaments in order to evaporate the pure metal and condense it onto a cooler substrate outside of the crucible [19]. Pyrolitic decomposition has been used to thermally break down precursor molecules containing U and Am, and form thin films of these active species [20]. In general, these early methods introduced large numbers of impurities, and resulted in poor control over the crystal quality of each sample.…”

Section: Pyrometallurgical Methodsmentioning

confidence: 99%

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

Vallejo¹,

Kabir²,

Poudel³

et al. 2022

Rep. Prog. Phys.

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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 modeling 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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Section: Pyrometallurgical Methodsmentioning

confidence: 99%

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

Vallejo¹,

Kabir²,

Poudel³

et al. 2022

Rep. Prog. Phys.

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show abstract

“…The crucible is then heated with direct current filaments in order to evaporate the pure metal and condense it onto a cooler substrate outside of the crucible [15]. Pyrolitic decomposition has been used to thermally break down precursor molecules containing U and Am, and form thin films of these active species [16]. In general, these early methods introduced large numbers of impurities, and resulted in poor control over the crystal quality of each sample.…”

Section: A Pyrometallurgical Methodsmentioning

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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“…Americium organometallic compounds and oxides are much more promising because of their greater volatility [17,18,19,20]. Quantitative measurements do not appear to exist, but temperatures ≈ 130 • C may provide sufficient vapor density.…”

Section: Collection Efficiencymentioning

confidence: 99%

Measuring (n,f) Cross Sections of Short-Lived States

Katz

2011

Nuclear Science and Engineering

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This paper reviews measurements of fission cross-sections of shortlived nuclear states, summarizes the formidable experimental difficulties involved and suggests novel methods of overcoming some of those difficulties. It is specifically concerned with the two such states that have been well characterized, the J π = 1 2 + (26 m) isomeric 235m U and the J π = 1 − (16 h) ground state (shorter lived than the isomer) 242gs Am, and with measuring their fission cross-sections at MeV energies. These measurements are formidably difficult, partly because of the need to produce, separate and collect the short-lived states before they decay, and partly because of their comparatively small fission cross-sections at these energies. I present quantitative calculations of the efficiency of advection of recoiling 235m U isomers by flowing gas in competition with diffusive loss to the surface containing the mother 239 Pu. This paper reports the initial development and evaluation of some of the methods that must be developed to make the experiments feasible.

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Production of films of uranium and americium compounds by thermal decomposition of volatile β-diketonates

Cited by 4 publications

References 0 publications

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

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

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

Measuring (n,f) Cross Sections of Short-Lived States

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