Abstract
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.
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© 2001 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- European Symposium on Nanomechanical Testing
- Aufsätze
- Comparison of Different Hardness Definitions Usable for Micro- and Nanoindentation
- Nanohardness Measurements for Industrial Applications
- Friction Studied with the Scanning Force Microscope
- Laser-Acoustics, a Method for Testing Coatings and Material Surfaces
- Nanoindentation Induced Acoustic Emission Monitoring of Native Oxide Fracture and Phase Transformations
- Deformation Curves of Ta-Silicide Thin Films Obtained in Cyclic Nanoindentation Experiments
- Pop-ins in Nanoindentations – the Initial Yield Point
- The Effect of Temperature and Strain Rate on the Hardness of Al and Al-Based Foams as Measured by Nanoindentation
- A Comparision of Nano-Hardness and Scratch-Resistance on Mohs Minerals
- Assisting an Experimental Investigation by Assessment and Use of a Thermodynamic Description for the Cd–Ge System
- Phase Equilibria and Thermodynamics in the Y2O3–Al2O3–SiO2 System
- The Constitution of Alloys in the Al-rich Corner of the Al–Si–Sm Ternary System
- The Al–Si–C Phase Diagram and Its Use for Microstructural Analysis of MMCp and MMCf Composite Materials
- Surface Segregation and Surface Tension in Liquid Fe–Cu Alloys
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- European Symposium on Nanomechanical Testing
- Aufsätze
- Comparison of Different Hardness Definitions Usable for Micro- and Nanoindentation
- Nanohardness Measurements for Industrial Applications
- Friction Studied with the Scanning Force Microscope
- Laser-Acoustics, a Method for Testing Coatings and Material Surfaces
- Nanoindentation Induced Acoustic Emission Monitoring of Native Oxide Fracture and Phase Transformations
- Deformation Curves of Ta-Silicide Thin Films Obtained in Cyclic Nanoindentation Experiments
- Pop-ins in Nanoindentations – the Initial Yield Point
- The Effect of Temperature and Strain Rate on the Hardness of Al and Al-Based Foams as Measured by Nanoindentation
- A Comparision of Nano-Hardness and Scratch-Resistance on Mohs Minerals
- Assisting an Experimental Investigation by Assessment and Use of a Thermodynamic Description for the Cd–Ge System
- Phase Equilibria and Thermodynamics in the Y2O3–Al2O3–SiO2 System
- The Constitution of Alloys in the Al-rich Corner of the Al–Si–Sm Ternary System
- The Al–Si–C Phase Diagram and Its Use for Microstructural Analysis of MMCp and MMCf Composite Materials
- Surface Segregation and Surface Tension in Liquid Fe–Cu Alloys
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences