State and tendency of developing physical-chemical methods for making actinide microspherical particles

Filippov, E.A.; Карелин, А. И.; Lobas, O. P.; Papkov, A. S.; Zhiganov, A. N.; Mishina, L. A.; Shamin, V. I.

doi:10.1007/bf02117546

Cited by 4 publications

(5 citation statements)

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“…Uranium microstructured materials with controlled size and shape have found applications in several branches of the nuclear industry including as targets for medical isotope production, − fuels for nuclear reactors, − standards for nuclear forensics, − and energy sources for space exploration . Morphological studies of actinide materials are also highly relevant to nuclear forensics-related work. , Potential applications include information storage, catalysis, sensors, and luminescent devices. − Most studies on uranium microstructured materials have focused on binary oxides, nitrides, carbides, and fluorides, with the spherical shape being the dominant morphology (Table ).…”

Section: Introductionmentioning

confidence: 99%

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Jang,

Poineau

2024

ACS Omega

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Uranium microstructured materials with controlled size and shape are relevant to the nuclear industry and have found applications as targets for medical isotope production, fuels for nuclear reactors, standards for nuclear forensics, and energy sources for space exploration. Until now, most studies at the microscale have focused on uranium microspheres (oxides, nitrides, carbides, and fluorides), while micromaterials of uranium halides, carbides, and pnictides with other morphologies are largely unknown. A promising method to shape the morphology of uranium micromaterials is the replacement of O by F atoms in oxide materials using a solid−gas reaction. Here, with the aim to elaborate unexplored uranium fluoride micromaterials, the fluorination of uranium oxide (U 3 O 8 and UO 2 ) microspheres (ms), microrods (mr), and microplates (mp) in an autoclave at 250 °C with HF (g) (produced from the thermal decomposition of silver bifluoride (SBF)) and with ammonium bifluoride (ABF) was evaluated. We show that the reactions between U 3 O 8 mr and U 3 O 8 mp and SBF provided the most efficient way to elaborate mr and mp UO 2 F 2 micromaterials in a high yield (∼90%). The resulting UO 2 F 2 mr (length: 3−20 μm) and UO 2 F 2 mp (width: 1−7.5 μm) exhibited a well-defined geometry that was identical to that of the U 3 O 8 precursors. Agglomerated (NH 4 ) 3 UO 2 F 5 and UO 2 F 2 ms (2−3.5 μm) were prepared from the reaction of U 3 O 8 ms with ABF. It is noted that the reaction of UO 2 ms with SBF and ABF did not provide any uranium fluoride micromaterials. The successful preparation of uranium fluoride microstructures (ms, mr, and mp) developed here opens the way to novel actinide fluoride micromaterials.

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Section: Introductionmentioning

confidence: 99%

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Jang,

Poineau

2024

ACS Omega

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“…Research on actinide microspheres started about six decades ago with the development of dense thorium–uranium oxide microstructural materials that would be compacted into nuclear reactor fuel tubes . The beginning of this century witnessed a regain of interest in the science of actinide microspheres, primarily due to the development of fuels for advanced reactors. , …”

Section: Introductionmentioning

confidence: 99%

“…1 The beginning of this century witnessed a regain of interest in the science of actinide microspheres, primarily due to the development of fuels for advanced reactors. 2,3 Uranium microspheres are conceptualized as fuel in various designs of high-temperature reactors in the form of uranium oxide/carbide kernels coated with ceramics 4 or uranium/ plutonium oxide particles. Uranium nitride microspheres can be prepared by internal gelation and carbothermic reduction 5 and exhibit better thermal conductivities and higher densities of fissile material than oxides.…”

Section: ■ Introductionmentioning

confidence: 99%

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Synthesis and Morphological Control of UO₂F₂Particulates

2023

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Uranium-based microspheres are of interest due to their potential applications as targets for medical isotopes production, as fuel for nuclear reactors, and as standardized materials for nuclear forensics. Here, for the first time, UO2F2 microspheres (1–2 μm) have been prepared from the reaction between UO3 microspheres and AgHF2 in an autoclave. In this preparation, a new fluorination method has been applied, and HF(g)produced in situ from the thermal decomposition of AgHF2 and NH4HF2was used as the fluorinating agent. The microspheres were characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Diffraction results indicated that the reaction performed with AgHF2 at 200 °C led to anhydrous UO2F2 microspheres, while at 150 °C, hydrated UO2F2 microspheres were obtained. Meanwhile, NH4HF2 led to the formation of contaminated products as driven by the formation of volatile species.

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“…The articles [1,2] consider the state and tendencies of the development of physicochemical methods for getting microspheric particles of nuclear fuel, evaluate their advantages and disadvantages, show that the process of getting microshperes can be done in automatic regime with a remote control.…”

Section: Introductionmentioning

confidence: 99%

Technology of getting of microspheric thorium dioxide

Balakhonov¹,

Matyukha²,

Saltan³

et al. 1999

Czech J Phys

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State and tendency of developing physical-chemical methods for making actinide microspherical particles

Cited by 4 publications

References 1 publication

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Synthesis and Morphological Control of UO₂F₂Particulates

Technology of getting of microspheric thorium dioxide

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State and tendency of developing physical-chemical methods for making actinide microspherical particles

Cited by 4 publications

References 1 publication

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials

Synthesis and Morphological Control of UO2F2Particulates

Technology of getting of microspheric thorium dioxide

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Synthesis and Morphological Control of UO₂F₂Particulates