Thermal decomposition of barium and strontium peroxides
1995; Elsevier BV; Volume: 255; Linguagem: Inglês
10.1016/0040-6031(94)02156-i
ISSN1872-762X
AutoresMichael J. Tribelhorn, Michael E. Brown,
Tópico(s)Energetic Materials and Combustion
ResumoAbstract Isothermal TG studies of the thermal decompositions in nitrogen of barium (490–610°C) and strontium (380–530°C) peroxides to the corresponding oxides with the evolution of gaseous oxygen showed that reactions were deceleratory overall with an initial relatively rapid process followed by the main deceleratory reaction. Curves of fractional decomposition (α) against time could be described by the Ginstling-Brounshtein diffusion model (low α) and the first-order rate equation (BaO 2 , α > 3.0; SrO 2 , α > 0.5). The activation energy for the main deceleratory process of the decomposition of BaO 2 is 185 ± 5 kJ mol −1 , which is considerably higher than the value of 119 ± 2 kJ mol −1 for the deceleratory stage of the SrO 2 decomposition. Non-isothermal kinetic analyses gave similar E a values for the decompositions of both BaO 2 and SrO 2 , namely 165 ± 5 kJ mol −1 . Possible mechanisms are discussed.
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