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Thermodynamic properties of quartz, cristobalite and amorphous SiO2: drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K

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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Submitted on : Monday, January 23, 2017 - 10:20:39 AM
Last modification on : Tuesday, May 26, 2020 - 6:50:58 PM

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Richet Pascal, Yan Bottinga, L. Denielou, J.P. Petitet, C. Tequi. Thermodynamic properties of quartz, cristobalite and amorphous SiO2: drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K . Geochimica et Cosmochimica Acta, Elsevier, 1982, 46 (12), pp.2639-2658. ⟨10.1016/0016-7037(82)90383-0⟩. ⟨insu-01443383⟩

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