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Gibbs free energies of formation of amorphous Si2O3, SiO and Si2O

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
189
Issue
3
Identifiers
DOI: 10.1016/0022-3093(95)00239-1
Disciplines
  • Physics

Abstract

Abstract A thermodynamic methodology was put forward to assess the standard heats of formation and absolute entropies of silicon oxides, based on various thermal behaviors such as decomposition temperatures. The standard heats of formation at 298 K thus calculated are 1345.53, 426.08 and 342.84 kJ/mol for Si 2O 3(am), SiO(am) and Si 2O(am), respectively. The standard entropies obtained by this method are 105.67, 61.60 and 133.08 (J/K)/mol for Si 2O 3(am), SiO(am) and Si 2O(am) at 298 K, respectively. Using these data, the equilibrium phase relations in the SiO system have been computed and shown graphically as a function of oxygen potential for the temperature range of 298–2500 K.

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