Thermodynamic properties of quartz,cristobalite and amorphous SiO2: drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K |
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| Authors: | P Richet Y Bottinga L Denielou JP Petitet C Tequi |
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| Institution: | Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe et Département des Sciences de la Terre, Université Paris VII, 4, Place Jussieu 75 251 Paris Cedex 05, France;Université de Nice, Parc Valrose, 06034 Nice, France;Laboratoire de Physique des Liquides Ioniques, Université Paris VI, 4, Place Jussieu 75 251 Paris Cedex 05, France |
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| Abstract: | We report relative enthalpy measurements on quartz, cristobalite and amorphous SiO2 between 1000 and 1800 K. We have observed a glass transition around 1480 K for amorphous SiO2. From our results and available Cp, relative enthalpy, and enthalpy of solution data we have derived a consistent set of thermodynamic data for these phases. Our calculated enthalpies of fusion are 8.9 ± 1.0 kJ mole?1 for cristobalite at 1999 K and 9.4 ± 1.0 kJ mole?1 at 1700 K for quartz. |
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