### Abstract

Some possible elementary reactions are not included in the classical mathematical models of thermal decomposition. For example, we can assume that in the thermal decompositions of simple carbonates a proportion of the O^{2-} ions produced on the reaction interface can migrate into the interior of the reactant phase, since at this temperature there is some probability of CO^{2} exchange between an O^{2-} and a neighbouring CO_{3}^{2-} ion. A similar diffusion-type process can be assumed in a wide class of decomposition reactions. The present state of computer science makes it possible to show by mathematical modelling how this migration influences the TG curves of the simplest contracting-sphere-type reactions. The resulting extended contracting-sphere model can provide the induction and the acceleration period of the TG curves.

Original language | English |
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Pages (from-to) | 179-185 |

Number of pages | 7 |

Journal | Journal of thermal analysis |

Volume | 12 |

Issue number | 2 |

DOIs | |

Publication status | Published - Oct 1 1977 |

### ASJC Scopus subject areas

- Chemistry(all)
- Chemical Engineering(all)
- Engineering(all)

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## Cite this

*Journal of thermal analysis*,

*12*(2), 179-185. https://doi.org/10.1007/BF01909474