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W2000286100 abstract "Abstract The kinetics of formation of uranium-neptunium mononitride by carbothermic reduction of uranium and neptunium oxides under flowing nitrogen has been investigated using thermogravimetric techniques in the temperature range 1670–1870 K. The starting blends were prepared from powder material and contained carbon in excess of the amount required to obtain the stoichiometric composition. The reaction investigated were: 1. (a) carbothermic synthesis of a low-carbon carbonitride containing free carbon, and 2. (b) decarburization of the carbonitride under nitrogen-8% hydrogen gas mixture. The carbothermic synthesis follows a first order rate equation and the value of the activation energy lies in the range 344 to 385 kJ/mol. A clear dependence of the activation energy on the neptunium or carbon content of the starting blends was not found. The removal of carbon impurity follows a phase boundary type rate equation with an activation energy of about 210 kJ/mol." @default.
W2000286100 created "2016-06-24" @default.
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W2000286100 date "1991-11-01" @default.
W2000286100 modified "2023-09-26" @default.
W2000286100 title "Investigation of the reaction UO2 + x + NpO2 + C + N2 by thermogravimetry" @default.
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W2000286100 doi "https://doi.org/10.1016/0022-3115(91)90331-z" @default.
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