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Kinetic Analysis of Solid-State Reactions: An Improved Analysis Method

Published online by Cambridge University Press:  10 February 2011

D. P. Smith  and
M. M. Chaudhri
D. P. Smith
Affiliation:
Materials Group, PCS, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UK., [email protected]
M. M. Chaudhri
Affiliation:
Materials Group, PCS, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UK., [email protected]
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Abstract

Many reactions of interest occur in the solid state, or with low mobility of the reactants or products, with the result that the physical mechanisms operative during the reaction determine the shape of the reaction rate-time profile; i.e. topochemistry is important. However, often improper account is taken of the physical mechanisms, resulting in erroneous values for the activation energy and kinetic constants.

An improved method of analysis is suggested, allowing the mechanisms of reaction to be determined explicitly. This thus allows the activation energy and kinetic constants to be determined with good theoretical justification. The method has been verified by studying the thermal decomposition of barium azide, where the activation energy was determined to better than 1%. The operative mechanisms so determined are in agreement with visual observations and the literature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 418: Symposium GG – Decomposition, Combustion, and Detonation Chemistry of Energetic Materials , 1995 , 105
Copyright
Copyright © Materials Research Society 1996

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