Abstract
Phase relationships in the CeO2–Gd2O3 slag system were experimentally investigated based on the equilibrated alloy technique at 1200, 1400 and 1600 °C. The phase analysis in the stove-cooled samples was carried out by X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The phase diagram was constructed in the whole compositional range based on experimental results. Three single phase regions, namely monoclinic (B) modification of Gd2O3, cubic (C) of Gd2O3, and fluorite (F) structure of CeO2, were observed. The solubility of Gd2O3 in F reaches up to 60.4 mol.% at 1600 °C, while СeO2 hardly dissolves in the B phase at 1200–1600 °C. No intermediate compounds were found under the conditions of our study. The lattice parameters of unit cells and the boundaries of the homogeneity field for solid solutions were carefully determined.
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