ISSN:
1551-2916
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Maschinenbau
,
Physik
Notizen:
The evaluation of the thermodynamic properties as well as the phase diagrams for the binary Na2O–SiO2, K2O–SiO2, and Li2O–SiO2 systems are carried out with a structural model for silicate melts and glasses. This thermodynamic model is based on the assumption that each metallic oxide produces the depolymerization reaction of silica network with a characteristic free-energy change. A least squares optimization program permits all available thermodynamic and phase diagram data to be optimized simultaneously. In this manner, data for these binary systems have been analyzed and represented with a small number of parameters. The resulting equations represent the thermodynamic and phase diagram data for these alkali metal oxide–silica systems within experimental error limits. In particular, the measured limiting liquidus slope at 〈inlineGraphic alt="inline image" href="urn:x-wiley:00027820:JACE00022:JACE_00022_mu5" location="equation/JACE_00022_mu5.gif"/〉 is well reproduced.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1551-2916.2004.00022.x
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