THE HEAT CAPACITY OF SYNTHETIC ANHYDROUS MG AND FE CORDIERITE
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dc.contributor.author | Geiger C.A. | |
dc.contributor.author | Voigtlander H. | |
dc.date.accessioned | 2021-01-25T02:42:44Z | |
dc.date.available | 2021-01-25T02:42:44Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=984762 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2000, 138, 1, 0046-0050 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23735 | |
dc.description.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: and 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, So 298 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. | |
dc.title | THE HEAT CAPACITY OF SYNTHETIC ANHYDROUS MG AND FE CORDIERITE | |
dc.type | Статья |
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