ON THE FRACTIONAL CONVERSION ALPHA IN THE KINETIC DESCRIPTION OF SOLID-STATE REACTIONS

For the kinetic description of the solid-state reactions, the dependence of the apparent kinetic parameters on the sample mass and/or particle size is discussed mathematically in relation to some problems on the fractional conversion alpha. As for the reaction proceeding according to the contracting geometry model, the use of the specific rate constant, independent of the sample mass and particle size, is recommended to obtain the sample mass-independent Arrhenius parameters. It is also pointed out that the distribution of a within the assembly of sample particles disturbs the successful use of alpha in the kinetic description of the solid-state reactions.