Phase equilibria and thermodynamics in the Y2O3-Al2O3-SiO2 system

O. Fabrichnaya, H. Jürgen Seifert, R. Weiland, T. Ludwig, F. Aldinger, A. Navrotsky

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119 Scopus citations


The enthalpy of formation of YAM (Y4Al2O9) and Y2Si2O7 (γ) has been derived using high-temperature drop solution calorimetry at 1073 K in molten alkali borate. The enthalpy of formation from oxides at 298 K is -6.24 ± 6.21 and -67.08 ± 5.98 kJ/mol for YAM and disilicate, respectively. The thermodynamic functions in the Y2O3-Al2O3 and Y2O3-SiO2 systems are assessed from phase equilibrium data and calorimetric measurements for YAG (Y3Al5O12), YAP (YAlO3), YAM (Y4Al2O9), Y2SiO5 and Y2Si2O7 phases. The calculated phase diagrams of the Al2O3-Y2O3 and Y2O3-SiO2 systems are in reasonable agreement with the experimental data. Suggestions for further experimental measurements on solid phases are given. Using limited phase equilibrium data for the ternary system Y2O3-Al2O3-SiO2, the thermodynamic functions are assessed. The liquidus surface, an isothermal section at 1673 K and isopleths in the systems Y3Al5O12-SiO2, YAlO3-SiO2, Y4Al2O9-SiO2, Y2SiO5-Al6Si2O13 and Y2Si2O7-Al6Si2 O13 are presented.

Original languageEnglish (US)
Pages (from-to)1083-1097
Number of pages15
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Issue number9
StatePublished - Sep 2001
Externally publishedYes


  • Assessment of thermodynamic parameters
  • Calorimetry
  • Phase equilibria

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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