Kinetic equations for diffusion-controlled precipitation reactions


Starink, M.J. (1997) Kinetic equations for diffusion-controlled precipitation reactions. Journal of Materials Science, 32, (15), 4061-4070. (doi:10.1023/A:1018649823542).

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Original Publication URL: http://dx.doi.org/10.1023/A:1018649823542

Description/Abstract

In the past it has been suggested that the Johnson-Mehl-Avrami Kolmogorov (JMAK) equation can be used to describe the progress of a large number of nucleation and growth reactions, including diffusion-controlled precipitation reactions, provided that nucleation is random. However, its validity has only been proved for reactions with a linear growth and not for diffusion-controlled precipitation reactions. Here, the ability of the JMAK equation to fit the experimental data of diffusion-controlled precipitation reactions has been compared with the Austin-Rickett (AR) equation
α=1−{[k(T)t]n+1}-1
In all cases studied the AR equation provides a better fit to the data and the obtained integer and half-integer values of n can be interpreted in terms of the physics of the transformation processes. The latter is mostly not possible for n values obtained from the JMAK equation. It is concluded that for the purpose of interpreting data of precipitation reactions, the AR equation is more appropriate than the JMAK equation.

Note: See www.eprints.soton.ac.uk/18827/ for improved analysis.

Item Type: Article
ISSNs: 0022-2461 (print)
Related URLs:
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21705
Date Deposited: 31 Jan 2007
Last Modified: 27 Mar 2014 18:11
URI: http://eprints.soton.ac.uk/id/eprint/21705

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