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Contributions to Mineralogy and Petrology

, Volume 138, Issue 1, pp 46–50 | Cite as

The heat capacity of synthetic anhydrous Mg and Fe cordierite

  • C. A. Geiger
  • H. Voigtländer
Article

Abstract

The heat capacity of synthetic anhydrous Mg and Fe cordierite was measured by differential scanning calorimetry (DSC). Mg cordierite was synthesized from a glass at high temperatures and shows an ordered structural state. Fe cordierite was synthesized hydrothermally and dehydrated under reducing conditions to obtain H2O-free material. IR spectroscopy was used to ascertain the lack of H2O in both phases. The molar volume of both phases was measured using powder X-ray diffraction giving 23.316 (7) J/bar for Mg cordierite and 23.672 (6) J/bar for Fe cordierite. DSC measurements between 300 and 950 K were made following the procedure of Bosenick et al. (1996). The data show a precision of about 1% in the case of Mg cordierite and 1.5% for Fe cordierite. Fitted Cp polynomials in J/mol/K are:

for Mg and Fe cordierite, respectively. The Cp values determined for Mg cordierite are slightly larger (1–3%) than those measured by drop calorimetry by Pankratz and Kelley (1963). The Cp data for Fe cordierite permit the calculation of its standard third-law entropy, So298 K from the reaction 3Fe cordierite=2 almandine + 4 sillimanite + 5 quartz giving 465 J/mol/K, which is in good agreement with recent model estimates.

Keywords

Differential Scanning Calorimetry Cordierite Sillimanite Contrib Mineral Petrol Almandine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • C. A. Geiger
    • 1
  • H. Voigtländer
    • 2
  1. 1.Institut für Geowissenschaften, Abteilung Mineralogie, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, D-24098 Kiel, Germany e-mail: NMP46@rz.uni-kiel.de Tel: +49-431-8802895; Fax: +49-431-8804457Germany
  2. 2.Institut für Geowissenschaften, Abteilung Mineralogie, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, D-24098 Kiel, GermanyGermany

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