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Study of the thermal decomposition kinetics of some rare earth carbonates,fluorocarbonates and fluorooxalates
Authors:G V Gavrilova  M Yu Konyukhov  V A Logvinenko  G N Sedova
Institution:(1) Institute of Inorganic Chemistry, Siberian Department of Russian Academy os Sciences, Novosibirsk;(2) Lensoviet Institute of Technology, 198013, RF St. Petersburg
Abstract:The thermal transformations of Pr and La carbonates, La, Ce, Pr, Nd, Sm, Eu and Gd fluorocarbonates, and La, Nd, Dy and Ho fluorooxalates were investigated. A Derivatograph Q-1000 (MOM, Hungary) was used for thermal analysis. The kinetics of the processes was studied in a flow reactor. The activation energies and preexponential factors for dehydration and decarbonization were calculated. Samples of Pr fluorocarbonate, Ho fluorooxalate, and Pr and La carbonates were exposed to γ-irradiation (dose from 6.2·106 to 6.1·107 rad). The influence of the irradiation dose upon the kinetic parameters (E a andA) of the processes was investigated.
Keywords:kinetics  rare earth carbonates  fluorocarbonates and fluorooxalates  thermal transformation
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