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A nanoscopic approach to the kinetics of anhydrite (100) surface growth in the range of temperatures between 60 and 120 C

✍ Scribed by Morales, J.; Astilleros, J. M.; Fernandez-Diaz, L.

Book ID: 115470432
Publisher: Mineralogical Society of America
Year: 2012
Tongue: English
Weight: 492 KB
Volume: 97
Category: Article
ISSN: 0003-004X
DOI: 10.2138/am.2012.4083

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✦ Synopsis

In situ observations of the growth of the anhydrite (100) surface in contact with supersaturated aqueous solutions under conditions within the stability field of this mineral (60-120 °C) were conducted using a hydrothermal atomic force microscope (HAFM). Advancement rates were measured for [001] steps, the most stable ones on the anhydrite (100) surface. Isothermal data fit well to linear correlations between step advancement rate and supersaturation; the activation energy for step advancement is 73 ± 5 kJ/mol. This is not significantly higher than activation energies reported for the growth of gypsum (60-70 kJ/mol) and does not support that slow dehydration rates of aqueous calcium is responsible for the well-known difficulty to precipitate anhydrite crystals from supersaturated aqueous solutions at temperatures well above the anhydrite-gypsum equilibrium temperature. The role of structural factors that could inhibit the growth of anhydrite is discussed.

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