Advertisement

Journal of Thermal Analysis and Calorimetry

, Volume 82, Issue 3, pp 671–675 | Cite as

Dependence of the preexponential factor on temperature

Errors in the activation energies calculated by assuming that Ais constant
  • J. M. Criado
  • L. A. Pérez-Maqueda
  • P. E. Sánchez-Jiménez
Article

Summary

The dependence of the preexponential factor on the temperature has been examined and the errors involved in the activation energy calculated from isothermal and non-isothermal methods without considering such dependence have been estimated. It has been shown that the error in the determination of the activation energy calculated ignoring the dependence of Aon Tcan be rather large and it is dependent on x=E/RT, but independent of the experimental method used. It has been also shown that the error introduced by omitting the dependence of the preexponential factor on the temperature is considerably larger than the error due to the Arrhenius integral approach used for carrying out the kinetic analysis of TG data.

non-isothermal kinetic analysis isothermal kinetic analysis preexponential factor and temperature 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • J. M. Criado
    • 1
  • L. A. Pérez-Maqueda
    • 2
  • P. E. Sánchez-Jiménez
    • 3
  1. 1.Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla- C.S.I.C.
  2. 2.Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla- C.S.I.C.
  3. 3.Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla- C.S.I.C.

Personalised recommendations