Optical properties, band structures, and phase transition of UO2+<i>x</i> epitaxial films deposited by polymer-assisted deposition

Zhang, Dongxu; Dong, Haopeng; Lou, Yuanfu; Zhong, Yi; Li, Fangfang; Fu, Xiuqing; Zheng, Yu‐Xiang; Li, Wenwu

doi:10.1063/5.0068829

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…We are aware of five references to the experimental measurement of the band gap in U 3 O 8 [39,40,[52][53][54]. The values vary considerably, but the consensus appears to be E g = 1.8 ± 0.2 eV.…”

Section: Spin Free Statesmentioning

confidence: 99%

Resonant inelastic x-ray scattering from U₃O₈ and UN

Bright

Harding

et al. 2023

J. Phys.: Condens. Matter

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Resonant inelastic x-ray scattering (RIXS) using an incident energy tuned to the uranium N 4,5 absorption edges is reported from epitaxial films of α-U3O8 and UN. Theory shows that for U3O8 the multiplets associated with a 5f 1 configuration with a ground state of 2 F 5/2 and the excited state of 2 F 7/2 are observed. However, the strong transition predicted at a transfer energy of 1.67 eV is not observed. We assume this is a consequence of the intermediate state lifetime broadening due to interaction with continuum states when the transferred energy exceeds the onset of the continuum in the presence of the core hole. This hypothesis is supported by the results obtained for the 5f-itinerant system UN, where no sharp transitions have been observed, although the broad scattering response centered at ∼ 1 eV is considered a signature of a predominantly 5f 3 configuration in this band-like semi-metallic system. These experiments and theory add important information on these materials, both of which have been investigated since the 1960s, as well as whether RIXS at the uranium N edge can become a valuable tool for actinide research.

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Section: Spin Free Statesmentioning

confidence: 99%

Resonant inelastic x-ray scattering from U₃O₈ and UN

Bright

Harding

et al. 2023

J. Phys.: Condens. Matter

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“…Their contribution also includes growth on several different substrates using magnetron sputtering. Further advances in this field since then include reactive sputtering on LSAT (110) [61, 62], magnetron sputtering on YSZ (100) [63], DC sputtering on SrTiO 3 (110) [64], PAD of UO 2+x by Zhang et al [65], and spin coat combustion on aluminum sheets by Roach et al [66]. U x Th 1−x O 2 thin film synthesis was achieved by Cakir et al to study surface reduction using ice [67].…”

Section: Thin Film Synthesismentioning

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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“…Their contribution also includes growth on several different substrates using magnetron sputtering. Further advances in this field since then include reactive sputtering on LSAT (110) [53,54], magnetron sputtering on YSZ(100) [55], DC sputtering on SrTiO 3 (110) [56], PAD of UO 2+x by Zhang et al [57], and spin coat combustion on aluminum sheets by Roach et al [58]. U x Th 1−x O 2 thin film synthesis was achieved by Cakir et alto study surface reduction using ice [59].…”

Section: A Thin Film Synthesismentioning

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.

show abstract

Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition

Cited by 3 publications

References 20 publications

Resonant inelastic x-ray scattering from U₃O₈ and UN

Resonant inelastic x-ray scattering from U₃O₈ and UN

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

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

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Optical properties, band structures, and phase transition of UO2+x epitaxial films deposited by polymer-assisted deposition

Cited by 3 publications

References 20 publications

Resonant inelastic x-ray scattering from U3O8 and UN

Resonant inelastic x-ray scattering from U3O8 and UN

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

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

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Product

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Resonant inelastic x-ray scattering from U₃O₈ and UN

Resonant inelastic x-ray scattering from U₃O₈ and UN