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Title of Journal: Phys Chem Minerals

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Abbravation: Physics and Chemistry of Minerals

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Springer Berlin Heidelberg

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DOI

10.1007/978-94-007-0753-5/7

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1432-2021

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Thermodynamic properties of chlorite and berthieri

Authors: Philippe Blanc Hélène Gailhanou Jacques Rogez Georges Mikaelian Hitoshi Kawaji Fabienne Warmont Stéphane Gaboreau Sylvain Grangeon JeanMarc Grenèche Philippe Vieillard Claire I Fialips Eric Giffaut Eric C Gaucher F Claret
Publish Date: 2014/05/10
Volume: 41, Issue: 8, Pages: 603-615
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Abstract

In the context of the deep waste disposal we have investigated the respective stabilities of two ironbearing clay minerals berthierine ISGS from Illinois USA Al0975FeIII0182FeII1422Mg0157Li0035Mn0002Si1332Al0668O5OH4 and chlorite CCa2 from Flagstaff Hill California USA Si2633Al1367Al1116FeIII0215Mg2952FeII1712Mn0012Ca0011O10OH8 For berthierine the complete thermodynamic dataset was determined at 1 bar and from 2 to 310 K using calorimetric methods The standard enthalpies of formation were obtained by solutionreaction calorimetry at 29815 K and the heat capacities were measured by heatpulse calorimetry For chlorite the standard enthalpy of formation is measured by solutionreaction calorimetry at 29815 K This is completing the entropy and heat capacity obtained previously by Gailhanou et al Geochim Cosmochim Acta 734738–4749 2009 between 2 and 520 K by using lowtemperature adiabatic calorimetry and differential scanning calorimetry For both minerals the standard entropies and the Gibbs free energies of formation at 29815 K were then calculated An assessment of the measured properties could be carried out with respect to literature data Eventually the thermodynamic dataset allowed realizing theoretical calculations concerning the berthierine to chlorite transition The latter showed that from a thermodynamic viewpoint the main factor controlling this transition is probably the composition of the berthierine and chlorite minerals and the nature of the secondary minerals rather than temperatureWe are very grateful to Randall E Hughes for his kindness in providing us with the berthierine sample for this study Financial support from the French National Radioactive Waste Management Agency ANDRA and from the French Geological Survey BRGM is gratefully acknowledged A Benisek and an anonymous reviewer are strongly thanked for valuable comments and suggestions on the manuscript


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