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A unified theory for the kinetic analysis of solid state reactions under any thermal pathway

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Abstract

The Ozawa concept of generalized time has been used for developing master plots for the different kinetic models describing solid state reactions. These plots can be indistinctly used for analysing isothermal or non-isothermal experimental data. It is demonstrated that it is not possible to discriminate the kinetic model from a single non-isothermal curve without a previous knowledge of the activation energy. However, it has been shown that the ln [(da/dt)/f(a)] data taken from a set of DTG curves obtained at different heating rates lie on a single straight line when represented as a function of 1/T only if the kinetic model really obeyed by the reaction is considered. Moreover, the true values of E and A are obtained from the slope and the intercept of this straight line.

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Authors and Affiliations

  1. Materials Science Institute and Physics of Condensed Matter Department Instituto de Ciencias de Materiales, C. S. I. C, Sevilla, Spain

    J. M. Criado

  2. Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-c.s.i.c, Américo Vespucio s/n, 41092, Sevilla, Spain

    L. A. Pérez-Maqueda & F. J. Gotor

  3. Joint Laboratory of Solid State Chemistry of the Czech Republic and University of Pardubice, 530 09, Pardubice, Czech Republic

    J. Málek

  4. Faculty of School Education, Hiroshima University Chemistry Laboratory, Hgashi-Hiroshima, 739-8524, Japan

    N. Koga

Authors
  1. J. M. Criado
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  2. L. A. Pérez-Maqueda
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  3. F. J. Gotor
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  4. J. Málek
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  5. N. Koga
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Criado, J.M., Pérez-Maqueda, L.A., Gotor, F.J. et al. A unified theory for the kinetic analysis of solid state reactions under any thermal pathway. Journal of Thermal Analysis and Calorimetry 72, 901–906 (2003). https://doi.org/10.1023/A:1025078501323

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  • DOI: https://doi.org/10.1023/A:1025078501323

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