Abstract
Calorimetric measurements were made of the heat of immersion in water of cassiterite that was either untreated or treated with 60% HNO3. The heats of immersion of cassiterite and fluorite were also calculated theoretically from the surface Gibbs energy components, and compared with the heat of immersion measured for cassiterite and that taken from the literature for fluorite. The results of the measurements and calculation revealed that the heat of immersion depends on the degree of hydration of the surface of cassiterite and fluorite. It was also found that it is possible to predict the heats of immersion in water of cassiterite and fluorite from the Lifshitz-van der Waals and acid-base components of the surface Gibbs energy.
Zusammenfassung
Mittels kalorimetrischen Methoden wurde die Immersionswärme in Wasser von unbehandeltem und mit 60% HNO3 behandeltem Zinnstein gemessen. Die Immersionswärme von Zinnstein und Flußspat wurden auch theoretisch anhand der Gibbs'schen Oberflächenenergiekomponenten berechnet und mit der für Zinnstein gemessenen und für Flußspat der Literatur entnommenen Immersionswärme verglichen. Der Vergleich von Messung und Berechnung erwies, daß die Immersionswärme vom Grad der Hydratation der Oberfläche von Zinnstein und Flußspat abhängt. Man fand weiterhin, daß für Zinnstein und Flußspat die Immersionswärme in Wasser anhand der Lifshitz van der Waals und Säure-Basenkomponenten der Gibbs'schen Oberflächenenergie vorhergesagt werden kann.
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González-Martín, M.L., Jańczuk, B. & Bruque, J.M. Relationship between heat of immersion and surface Gibbs energy of fluorite and cassiterite. Journal of Thermal Analysis 44, 1087–1094 (1995). https://doi.org/10.1007/BF02547537
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DOI: https://doi.org/10.1007/BF02547537