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The Heat Capacity of the Serpentine Subgroup Mineral Berthierine (Fe2.5Al0.5)[Si1.5Al0.5O5](OH)4

Published online by Cambridge University Press:  01 January 2024

Christian Bertoldi ,
Edgar Dachs ,
Lado Cemic ,
Thomas Theye ,
Richard Wirth  and
Werner Groger
Christian Bertoldi*
Affiliation:
Abteilung Mineralogie und Materialwissenschaften, Fachbereich Geographie, Geologie und Mineralogie, Paris Lodron Universität Salzburg, Hellbrunnerstraße 34, 5020 Salzburg, Austria
Edgar Dachs
Affiliation:
Abteilung Mineralogie und Materialwissenschaften, Fachbereich Geographie, Geologie und Mineralogie, Paris Lodron Universität Salzburg, Hellbrunnerstraße 34, 5020 Salzburg, Austria
Lado Cemic
Affiliation:
Institut für Geowissenschaften, Christian Albrechts Universität zu Kiel, Ludewig-Meyn-Strasse 10, 24118 Kiel, Germany
Thomas Theye
Affiliation:
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstrasse 18, 70174 Stuttgart, Germany
Richard Wirth
Affiliation:
GeoForschungsZentrum Potsdam, Telegraphenberg, 14473 Potsdam, Germany
Werner Groger
Affiliation:
Forschungsinstitut für Elektronenmikroskopie und Feinstrukturforschung, Technische Universität Graz, Steyrergasse 17, 8010 Graz, Austria
*
*E-mail address of corresponding author: christian.bertoldi@sbg.ac.at
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Abstract

The serpentine subgroup mineral berthierine was synthesized as a metastable precursor of the chlorite group mineral chamosite in cold seal pressure vessels at 575°C, 0.5 GPa and fO2-conditions of the NNO buffer from a glass of almandine bulk composition. The run products were investigated with X-ray powder diffraction (XRD), Mossbauer spectroscopy and electron microprobe analysis. One run product was also investigated by high-resolution transmission electron microscopy (HRTEM) and its heat capacity measured by heat pulse calorimetry and by differential scanning calorimetry in the temperature range 5–323 K. The XRD and HRTEM investigations clearly showed that the periodicity along the c axis of this sample is 7 Å demonstrating that the serpentine subgroup mineral berthierine of composition (Fe2+1.83Fe3+0.33Al0 67)[Si1.33Al0.67O5](OH)4 has formed in the synthesis experiments.

Integration of our heat capacity data, corrected to the composition (Fe2.5Al0.5)[Si1.5Al0.5O5](OH)4 for end-member berthierine, yields a standard entropy of 284.1±0.3 J mol−1 K−1. The Cp polynomial Cp = 610.72 − 5140.0 × T−0.5 − 5.8848 × 106T−2 + 9.5444 × 108T–3 is recommended for thermodynamic calculations above 298 K involving berthierine.

Keywords

BerthierineDifferential Scanning CalorimetryHeat CapacityHeat-pulse CalorimetrySerpentine Subgroup MineralsStandard Entropy
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 4 , August 2005 , pp. 380 - 388
Copyright
Copyright © The Clay Minerals Society 2005

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