Microstructure, electrical properties and phase equilibria relationships in the ZrO2-Y2O3-TiO2 system: the subsolidus isothermal section at 1500 degrees C

The thermodynamic data found in the literature on the binary systems ZrO2-Y2O3 and ZrO2-TiO2 are briefly reviewed. Scarce information can be found about the ternary system ZrO2-Y2O3-TiO2. In this study the isothermal section of the ternary system at 1500 degrees C in air in the zirconia rich region Is outlined. The isoconductivity lines in air, obtained by using impedance spectroscopy analysis, are drawn on the isothermal section. Results from energy-dispersive X-ray analysis in the scanning electron microscope were used to correlate both, the thermodynamical data and the electrical behaviour. From the isothermal section and the isoconductivity lines it is possible to design materials for, specific applications. (C) 1997 Elsevier Science S.A.