ISSN:
1089-7550
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
The applicability of peak methods of nonisothermal kinetic data analysis is considered in this paper with focus on the influence of critical temperature; cooling experiments are also discussed. The method of analysis used in the paper is based on the Johnson–Mehl–Avrami [W. A. Johnson and K. F. Mehl, Trans. AIME 135, 315 (1941) and M. Avrami, J. Chem. Phys. 7, 1103 (1939)] rate equation, combined with the modified temperature dependence of reaction rate (including critical temperature). Using this method model, temperatures corresponding to the maximum reaction rate for different cooling/heating rates were found, and the applicability of different peak methods was tested. It is concluded that only the Kissinger [J. Res. Natl. Bur. Stand. 57, 217 (1965)] method gives correct values of activation energy, and that even this method can only be applied when analyzing reactions without (or with very low) critical temperature during heating experiments.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.343835
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