Abstract
The effect of the semiconductive oxides CuO, TiO 2 and Cr 2O 3 on the isothermal decomposition of barium oxalate has been studied gasometrically. Plots of the fraction decomposed versus time (α- t), for pure salt as well as mixtures, indicate an initial gas evolution, a linear period and a sigmoidal regime consisting of acceleratory and decay stages. The data are best fitted to the Prout-Tompkins relationship indicating that nucleation occurs in a chainbranching manner over the entire sigmoidal zone. The oxides CuO and TiO 2, being p- and n-type semiconductors respectively, do not affect the initial gas loss or the linear period but facilitate the acceleratory stage. However, the former decelerates the rate of the decay period whereas the latter does not affect it. Cr 2O 3, a p-type semiconducting oxide, retards the rate in both the stages.
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