| Autor: |
Eva Jud-Sierra, Ludwig J. Gauckler, Nicholas Grundy, Toni Ivas, Erwin Povoden-Karadeniz, Jürgen Grässlin |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society. 96:613-626 |
| ISSN: |
0002-7820 |
| DOI: |
10.1111/jace.12004 |
| Popis: |
New phase diagram data and a thermodynamic assessment of the CeO-Gd2O3-CoO system using the CALPHAD approach are presented. This information is needed to understand the surprisingly low sintering temperature (950°C–1050°C) of CeO2-based materials doped with small amounts of transition metal oxide (e.g., CoO). Experimental phase equilibria between 1100°C and 1300°C are reported based on the analysis of annealed and molten samples. No isolated compound exists in the ternary. At 1300°C the Co solubility in the ternary compounds Ce1−x−yGdxCoyO2−x/2−y (fluorite) is 2.7 mol% and is less than 1 mol% in the Gd2−xCexO3+x/2 (bixbyite). The Ce solubility in the perovskite GdCoO3−δ was found to be 1 mol%. The lowest temperature eutectic melt in the ternary has a composition of 57.2 mol% Co and 41.1 mol% Gd melting at an onset temperature of 1303 ± 5°C, which is close to the binary eutectic in the Gd2O3-CoO system at 60 ± 2 mol% Co and 1348 ± 1°C. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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