Experimental phase diagram determination and thermodynamic assessment of the La2O3–SrO system

Abstract New phase diagram data and a thermodynamic assessment of the Gd 2 O 3 –CoO system using the CALPHAD approach are presented, giving liquidus data and mutual solid solubilities of Co in Gd 2 O 3 and Gd in CoO. The thermodynamic model parameters for the ternary Gd–Co–perovskite phase and for the mutual solid solubilities of Co in Gd 2 O 3 and Gd in CoO are optimized to reproduce these new experimental data, as well as phase diagram data from literature. The Gd 2 O 3 –CoO phase diagram is refined based on the results of experiments using combined differential thermal analysis and thermogravimetry, scanning electron microscopy and X-ray diffraction techniques.