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Mechanism and Kinetics for the Formation of Uranium Mononitride by the Reaction of Uranium Dioxide with Carbon and Nitrogen
Author(s) -
MUROMURA TADASUMI,
TAGAWA HIROAKI
Publication year - 1978
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1978.tb09223.x
Subject(s) - chemistry , reaction mechanism , kinetics , uranium , decarburization , nitrogen , activation energy , chemical kinetics , reaction rate , order of reaction , inorganic chemistry , materials science , reaction rate constant , metallurgy , catalysis , organic chemistry , physics , quantum mechanics
The mechanism and kinetics of UN formation by reaction of a pellet of mixed UO 2 and C with N 2 were studied for temperatures of 1420° to 1750°C. The reaction followed the first‐order rate equation; the activation energy was 83 kcal/mol. Only UN 1−x C x was produced. The lattice parameter variation of UN 1−x C x had a minimum and a maximum during reaction; at the maximum, UN 1−x C x + C + N 2 were in equilibrium. The overall reaction was divided into four stages: (1) formation of UN 1−x C x from UO 2 , (2) decarburization of UN 1−x C x , (3) formation of UN 1−x C x with the equilibrium composition, and (4) pure UN formation. The lowest reaction rate was in stage (4).