Abstract
The kinetics of reaction between BaCO3 and ZnO were studied using thermogravimetric analysis to monitor the percent reaction versus time. Solid state reaction models based on (a) product growth controlled by diffusion through a continuous product layer, (b) product growth controlled by phase boundary reactions, and (c) the concept of an order of reaction, were invalid for the reaction studied. The kinetics of the reaction were described by the kt=–ln (1 –x)⅔ nuclei growth equation. The defect nature of the zinc oxide studied was altered by doping with Li2O and Cr2O3. The activation energy for the reaction of BaCO3 and pure ZnO was 54.6 kcal/mole. The changes in activation energy with the type and amount of ZnO doping cannot be accounted for by the quasi‐chemical theory of solids.
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