Abstract
Solid-state thermal processes have their own specificity, distinguishing them from the processes in gases and liquids. This specificity includes, among others, their limited reversibility and the limited or modified role of chemical affinity as the main driving force indicating the direction of real solid-state processes. The consequency is the formation of metastable compounds or phases during heating, as intermediate steps towards the state of thermodynamic equilibrium. They are a results of the particular properties of the rigid internal structure of minerals and materials as the thermal reaction medium. The peculiarities of thermal reactions of solids are presented on the example of those of oxides (silicates and borates) with polymeric structures. The significance of crystal-chemical factors for the prediction or explanation of the course of high-temperature processes, as complementing the thermodynamic factors, is discussed.
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Dedicated to Dr. Robert Mackenzie on the occasion of his 75th birthday
This work was supported by grant P040703406 from the National Committee of Scientific Research of Poland.
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Stoch, L. Nature and philosophy of thermal processes in minerals and inorganic materials. Journal of Thermal Analysis 48, 121–133 (1997). https://doi.org/10.1007/BF01978971
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DOI: https://doi.org/10.1007/BF01978971