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Kinetics and Mechanism of the Reaction Between Zinc Oxide and Barium Carbonate
Author(s) -
HULBERT SAMUEL F.,
KLAWITTER JEROME J.
Publication year - 1967
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1967.tb15167.x
Subject(s) - activation energy , thermogravimetric analysis , chemical kinetics , zinc , reaction mechanism , kinetics , order of reaction , chemistry , inorganic chemistry , barium , chemical reaction , barium carbonate , diffusion , oxide , doping , materials science , reaction rate constant , catalysis , thermodynamics , organic chemistry , raw material , physics , optoelectronics , quantum mechanics
The kinetics of reaction between BaCO 3 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 Li2 O and Cr 2 O 3 . The activation energy for the reaction of BaCO 3 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.