ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (3) 151 - 158 (1994)


THERMODYNAMIC CHARACTERIZATION OF MULLITE
 
Djuric Mirjana 1, Mihajlov Andjelka 1, Živanovic Branislav 2, Petrašinovic-Stojkanovic Ljiljana 2
 
1 Faculty of Technology, 21000 Novi Sad, Yugoslavia
2 Center for Multi-disciplinary Study, 11000 Beograd, Yugoslavia

Giving advantage to the 2.762Al₂O₃ 2SiO₂-formula and applying the phase equilibrium criterion, to the discrete points at the mullite liquidus curve, two sets of ΔG-values of mullite were calculated, by using two mathematical models, for the temperature interval 1860-2122 K as well as the composition range 5-50 mol% Al₂O₃ in the Al₂O₃-SiO₂-system. ΔG-values for 3Al₂O₃ 2SiO₂-formula were presented too. The most probable set of ΔG-values was selected and a correlation between the Gibbs free energy of mullite and temperature was suggested, after adopting both referent state enthalpy and entropy. Also, the parameters in the specific heat function were obtained, as a result of the correlating procedure.


PDF (1.2 MB)
 
Licence Creative Commons © 2015 - 2022
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact