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- W2087051250 abstract "Complex carbonates with the general formula (NH4)4AnO2(CO33) (An ≡ U, U + Pu, Pu, Np) were prepared by adding solid (NH4)2C03 to solutions containing AnVI ions which were obtained either by oxidation of AnVI and Anv hydroxides with ozone or by treating concentrated AnIV solutions with boiling 14 M HNO3. In particular the following carbonates were prepared: (NH4)4UO2(CO3), (NH4)4U0.7Pu0.3O2(CO3) 3, (NH4)4U0.5Pu0.5O2(CO3)3, (NH4)4U0.3Pu0.7O2(CO3)3, (NH4)4PuO2(CO3)3 and (NH4)4NpO2(CO3)3. The X-ray powder patterns indicate that all these carbonates crystallize in a monoclinic system (space group, C2m). The thermal behavior of these compounds was investigated by means of thermogravimetry, mass spectroscopy, X-ray crystallography and differential thermal analysis, including calculation of the heats of formation. Various decomposition mechanisms which depended on the [Pu][U + Pu] ratio were observed. Carbonates containing less than 50% Pu decomposed in a single step to (U, Pu) oxide phases. The decomposition of carbonates with [Pu][U + Pu] ⩾ 50% took place in two steps: intermediate UxPu1 − xO2CO3 was formed which subsequently decomposed to (U, Pu) oxide phases. p]Thermal decomposition in an Ar-6.5%H2 atmosphere was found to be a suitable method of obtaining well-defined homogeneous (U, Pu) dioxides." @default.
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- W2087051250 date "1983-05-01" @default.
- W2087051250 modified "2023-09-25" @default.
- W2087051250 title "Preparation and properties of complex carbonates of hexavalent actinides" @default.
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- W2087051250 doi "https://doi.org/10.1016/0022-5088(83)90101-7" @default.
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