Thermodynamic properties of quartz, cristobalite and amorphous SiO 2 : drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K

Details Thermodynamic properties of quartz, cristobalite and amorphous SiO 2 : drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K Thermodynamic properties of quartz, cristobalite and amorphous SiO 2 : drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2639r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 12, pp.2639-2658

Physics

58

Scientific paper

We report relative enthalpy measurements on quartz, cristobalite and amorphous SiO 2 between 1000 and 1800 K. We have observed a glass transition around 1480 K for amorphous SiO 2 . From our results and available C p , 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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