Abstract
Controlled transformation Rate Thermal Analysis (CRTA) as well as conventional thermoanalytical methods are reviewed in an attempt to get a wider comprehension of the kinetics of solid-state reactions. It is worthy of note that the apparent activation enegies E determined from the rate-jump method of CRTA are nearly constant irrespective of the sample size within a sample size range of 20∼200mg for the thermal decomposition of dolomite. On the other hand, some sample size dependence of E is inevitable with the conventional dynamic kinetic analyses unless the sample size is smaller than ca. 2mg. Errors inherent in such kinetic parameters determined for the solid-state reactions are considered in view of the feature characteristic of solid-state reactions as well as the assumption and prerequisite for the kinetic analyses. It is stressed, as for the conventional dynamic analyses, that isoconversion methods, e. g., the Flynn-Wall-Ozawa method, are useful in obtaining reliable Arrhenius parameters of the solidstate reactions in general. It is evident that isothermal analyses should also be made together with the conventional dynamic analyses with as smaller a sample size as possible.
