Formation of Neptunium(V) Carbonates: Examining the Forceful Influence of Alkali and Alkaline Earth Cations

Kuzenkova, A.S.; Plakhova, T.V.; Nevolin, I.M.; Kulikova, E.S.; Trigub, A.L.; Yapaskurt, V.O.; Shaulskaya, M.D.; Tsymbarenko, D.M.; Romanchuk, A.Y.; Kalmykov, S.N.

Авторы: Kuzenkova Anastasiia S., Plakhova Tatiana V., Nevolin Iurii M., Kulikova Elizaveta S., Trigub Alexander L., Yapaskurt Vasiliy O., Shaulskaya Maria D., Tsymbarenko Dmitry M., Romanchuk Anna Yu, Kalmykov Stepan N.
Журнал: Inorganic Chemistry
Год издания: 2023
Издательство: American Chemical Society
Местоположение издательства: United States
DOI: 10.1021/acs.inorgchem.3c02737
Аннотация: Herein, neptunium(V) carbonates containing sodium or potassium cations were synthesized via chemical precipitation. Various techniques such as scanning electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetry combined with differential scanning calorimetry, X-ray diffraction, and X-ray absorption spectroscopy were used to analyze the microstructures and elemental compositions of these samples. The crystal structures of hydrated NaNpO2CO3·3H2O (P1, a = 4.3420(2) Å, b = 4.8962(2) Å, c = 10.0933(11) Å, α = 91.014(7)°, β = 77.834(11)°, and γ = 90.004(10)°) and KNpO2CO3 (P63/mmc, a = b = 5.0994(2) Å, c = 10.2210(15) Å) were determined for the first time using the Rietveld method. The synthesized carbonates exhibited distinct structural features and decomposition behaviors, as demonstrated through thermogravimetry analysis, which revealed the presence of crystalline hydrate water in sodium neptunium(V) carbonate. Furthermore, calcium-containing neptunium(V) carbonates were synthesized and characterized. Samples with the general composition Ca0.5NpO2CO3 were obtained using the ion exchange method and chemical precipitation from solutions containing competing cations (Ca2+, Na+, K+, and Mg2+). The synthesis conditions notably affected the diffraction patterns of the obtained calcium neptunium(V) carbonates. This investigation enhances our understanding of the structural properties and thermodynamic stability of neptunium(V) carbonates in the presence of diverse cations commonly found under radioactive waste disposal conditions.
Добавил в систему: Кузенкова Анастасия Сергеевна

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Formation of Neptunium(V) Carbonates: Examining the Forceful Influence of Alkali and Alkaline Earth Cationsстатья

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