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Internal thermal reactions in minerals and materials

  • Earth Sciences
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Abstract

Rebuilding reactions of the internal structure of minerals and their artificial analogues are considered. Solid products of these reactions are formed within the structure of the parent substance. This factor determines the course of the reactions and product formation. The mechanism of internal thermal dissociation and rebuilding reactions of internal structure connected with segregation of chemical components and their redistribution (crystallization of multicomponent amorphous solids) is discussed. The internal pressure of gaseous decomposition products and rate of diffusion of chemical components are critical factors influencing kinetics of these processes. Diffusional mass transfer during internal structure rebuilding reactions is directed by acid-base interaction of the parent-structure components; this determines the stages of the reaction pathway.

Zusammenfassung

Es wurden Umbaureaktionen der inneren Struktur von Mineralen und deren künstlichen Analogen betrachtet. Feststoffprodukte dieser Reaktionen werden innerhalb der Struktur der Mutterverbindungen gebildet. Dieser Faktor bestimmt den Reaktionsweg und die Produktbildung. Es wird der Mechanismus von interner Thermodissoziation und von Umbaureaktionen der inneren Struktur in Verbindung mit der Segregation der chemischen Komponenten und deren Umverteilung (Kristallisation von Mehrkomponenten-Amorphsalzen) besprochen. Der innere Druck der gasförmigen Zersetzungsprodukte und die Diffusionsgeschwindigkeit der chemischen Komponenten sind bestimmende Faktoren, die die Kinetik dieser Prozesse beeinflussen. Der diffusive Massetransport während der Umbaureaktionen der inneren Struktur wird durch eine Säure-Base-Wechselwirkung der Komponenten der Mutterstruktur gesteuert; hierdurch werden die Schritte des Reaktionsweges bestimmt.

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Stoch, L. Internal thermal reactions in minerals and materials. Journal of Thermal Analysis 40, 107–114 (1993). https://doi.org/10.1007/BF02546560

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