2026-06-27T22:46:10Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/426982024-07-18T17:00:46Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Morales Sánchez-Migallón, Juan
author
Astilleros García-Monge, José Manuel
author
Fernández Díaz, María Lourdes
2023-06-20T00:31:54Z
2023-06-20T00:31:54Z
2012
Online : 1945-3027. Print: 0003-004X
10.2138/am.2012.4083
https://hdl.handle.net/20.500.14352/42698
http://ammin.geoscienceworld.org/content/97/5-6/995
http://www.minsocam.org/
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.
eng
A nanoscopic approach to the kinetics of anhydrite (100) surface growth in the range of temperatures between 60 and 120 °C
journal article
URL
https://docta.ucm.es/bitstreams/3efa0c88-f3c8-40f5-8bb8-38703aeb8b48/download
File
MD5
31d8889f6583efb7eb310ae61c52a4e5
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application/pdf
995.full.pdf
URL
https://docta.ucm.es/bitstreams/501357fb-9aef-4019-85f6-6b2f3093dcd7/download
File
MD5
0ce64b5bbda6502ccb8ef2c20d933a1a
26033
text/plain
995.full.pdf.txt