| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7897776 | Journal of the European Ceramic Society | 2018 | 13 Pages |
Abstract
The phase equilibria in the YO1.5-TaO2.5 binary system were studied in air from 1250â¯Â°C to 1700â¯Â°C across the entire composition range, clarifying discrepancies in previous investigations. Materials were synthesized by precursor routes and phases identified by X-ray diffraction and Raman spectroscopy. Solubility limits were determined using TEM/EDS and EPMA. The fluorite phase field was shown to extend down to at least 1250â¯Â°C. Ordering phenomena in two closely related phases near Y3TaO7 were investigated, suggesting a second-order ordering relationship between them. The order-disorder transformation to fluorite was observed to occur through formation of a superstructure. The homogeneity range for YTa7O19 was expanded based on chemical analysis, while YTa3O9 was shown to be a line compound. The emerging understanding provides valuable insight into related ternary systems as well as inputs for thermodynamic assessments.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Abel N. Fernandez, Chandra A. Macauley, Daesung Park, Carlos G. Levi,