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Details
Experimental Phase Diagram Determination and Thermodynamic Assessment of the CeO2-Gd2O3-CoO System
| Author | Ivas, T.; Povoden-Karadeniz, E.; Grundy, N.; Jud-Sierra, E.; Grasslin, J.; Gauckler, L. J. | |
| Year | 2013 | |
| Type | Journal Article | |
| Journal | Journal of the American Ceramic Society | |
| Volume | 96 | |
| Issue | 2 | |
| Pages | 613-626 | |
| Date | Feb | |
| ISSN | 0002-7820 | |
| Accession Numer | WOS:000314922200048 | |
| Abstract | 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 degrees C1050 degrees C) of CeO2-based materials doped with small amounts of transition metal oxide (e.g., CoO). Experimental phase equilibria between 1100 degrees C and 1300 degrees C are reported based on the analysis of annealed and molten samples. No isolated compound exists in the ternary. At 1300 degrees C the Co solubility in the ternary compounds Ce1xyGdxCoyO2x/2y (fluorite) is 2.7mol% and is less than 1mol% in the Gd2xCexO3+x/2 (bixbyite). The Ce solubility in the perovskite GdCoO3 was found to be 1mol%. The lowest temperature eutectic melt in the ternary has a composition of 57.2mol% Co and 41.1mol% Gd melting at an onset temperature of 1303 +/- 5 degrees C, which is close to the binary eutectic in the Gd2O3-CoO system at 60 +/- 2mol% Co and 1348 +/- 1 degrees C. | |
| Notes | Ivas, Toni Povoden-Karadeniz, Erwin Grundy, Nicholas Jud-Sierra, Eva Graesslin, Jurgen Gauckler, Ludwig J. | |
| URL |
Access publication [Website] Access publication [Website] |
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| Link to PDF | ||
| Record Number | 8 | |
| Group | nonmet |
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