Phase Equilibria and Thermodynamics in the Y2O3-Al2O3-SiO2System

被引：0

作者：

Fabrichnaya, Olga ^{[1
]}

Seifert, Hans Jürgen ^{[1
]}

Weiland, Reinhold ^{[1
]}

Ludwig, Thomas ^{[1
]}

Aldinger, Fritz ^{[1
]}

Navrotsky, Alexandra ^{[2
]}

机构：

[1] Max-Planck-Institut für Metallforschung, Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Stuttgart, Germany

[2] Thermochemistry Facility, Department of Chemical Engineering and Materials Science, University of California, Davis, United States

来源：

International Journal of Materials Research | 2001年 / 92卷 / 09期

基金：

美国国家科学基金会;

关键词：

Ternary systems - Yttrium aluminum garnet - Phase equilibria - Enthalpy - Calorimeters - Silica - Aluminum oxide - Alumina;

D O I：

10.3139/ijmr-2001-0197

中图分类号：

学科分类号：

摘要：

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-Al6Si2O13 are presented. © 2001 Carl Hanser Verlag, München.

引用

页码：1083 / 1097