2021年12月15日 · Powder X-ray diffraction (pXRD) and thermogravimetric analysis (TGA) were used to characterize any changes to the bulk material and X-ray photoelectron spectroscopy (XPS) was used to investigate any changes to the surface of the UF 4. Based on previous studies of uranium oxides and UOCs, it is expected that high relative humidity (RH ...

2024年9月24日 · The thermal analysis behavior of C6H6N3[ReO4] was studied by simultaneous thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) up to 700 °C under argon.

2009年11月1日 · We have presented TG/DTA reaction profiles for the reaction of NF 3 with uranium metal, UO 2, UF 4, UO 3, U 3 O 8, and UO 2 F 2 ·2H 2 O. Calculated enthalpies and free energies of formation of UF 6 from these compounds predict a correlation with the uranium oxidation state and this was qualitatively observed in the TGA experimental data.

2024年9月24日 · Anhydrous and hydrated UF4 microrods (5–25 μm) were prepared from the reactions of UO2 microrods (5–15 μm) with HF(g), produced from the decomposition of silver bifluoride (AgHF2, SBF). In order to optimize the preparation of UF4 mr, several experimental parameters including atmosphere (air or N2), temperatu

2024年9月24日 · Anhydrous and hydrated UF 4 microrods (5–25 μm) were prepared from the reactions of UO 2 microrods (5–15 μm) with HF (g), produced from the decomposition of silver …

Pure UF4 and ThF4 were synthesised using HF gas fluorination of the respective oxides and characterised by X-ray diffraction and differential scanning calorimetry. For the first time, the melting point of UF4 was determined directly by a calorimetric technique using a pure sample and was found at a temperature of 1034.7 ± 3°C.

2021年8月1日 · Thermogravimetic analysis-mass spectrometry (TGA-MS) and differential scanning calorimetry (DSC) were used to correlate transitions in the calcined material to morphological transformations.

2022年7月15日 · The most prominent fissile fuel proposed for molten salts is uranium tetrafluoride (UF4) using 233 U of the thorium fuel cycle. UF 4 is extremely hygroscopic, meaning it will react with moisture and oxygen in its environment, so as-received powders contain significant levels of …

2009年11月1日 · The objective of this paper is to demonstrate that NF3 fluorinates uranium metal, UO2, UF4, UO3, U3O8, and UO2F2•2H2O to produce the volatile UF6 at temperatures between 100 and 500ºC. Thermogravimetric reaction profiles are described that reflect changes in the uranium oxidation state and discrete chemical speciation.

2002年5月1日 · Phase Equilibria in the Alkali Fluoride-Uranium Tetrafluoride Fused Salt Systems: II, The Systems KF-UF4 and RbF-UF4. Journal of the American Ceramic Society 1958, 41 (12) , 538-544. DOI: 10.1111/j.1151-2916.1958.tb12912.x.