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Volumetric properties and phase relations of silica - thermodynamic assessment
KTH, Superseded Departments, Materials Science and Engineering.ORCID iD: 0000-0002-8493-9802
KTH, Superseded Departments, Materials Science and Engineering.
2001 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 327, no 1-2, 253-262 p.Article in journal (Refereed) Published
Abstract [en]

Taking into account various available experimental data, an improved internally consistent data set for the SiO2 system is obtained by thermodynamic assessment. The volumetric properties for SiO2 polymorphs are reassessed using the CALPHAD method. A two-coefficient expression is used to describe the thermal expansion and bulk modulus. For liquid phase, one equation is achieved in the temperature range of 298-4000 K either for thermal expansion or for bulk modulus. Phase diagrams have been calculated up to 40 GPa. It has been concluded that, in the pressure range lower than 20 GPa, there is no significant difference between the phase diagrams calculated by the Birch-Murnaghan equation of state (EOS) and by Murnaghan EOS.

Place, publisher, year, edition, pages
2001. Vol. 327, no 1-2, 253-262 p.
Keyword [en]
thermodynamic assessment, silica, phase diagram, volumetric properties, coesite-stishovite transition, high-pressure, alpha-quartz, thermal-expansion, x-ray, heat-capacities, cristobalite, sio2, transformations, temperature
URN: urn:nbn:se:kth:diva-20934ISI: 000170943000048OAI: diva2:339631
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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