Publications in Scientific Journals:
T. Ivas, E. Povoden-Karadeniz, A. Grundy, E. Jud-Sierra, J. Grässlin, L.J. Gauckler:
"Experimental phase diagram determination and thermodynamic assessment of the CeO2-Gd2O3-CoO system";
Journal of the American Ceramic Society,
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 metaloxide (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. At1300°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 Gd2xCexO3+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.
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
Created from the Publication Database of the Vienna University of Technology.