Abstract
Sm2Zr2O7 and Gd2Zr2O7 are two promising transparent ceramic materials with high density and effective atomic number. However, the phase diagram of Gd2O3-Sm2O3-ZrO2 system has not been systematically studied. To determine the phase relationship of the ternary system Gd2O3-Sm2O3-ZrO2 at 1600°C and 1400°C, a serious of ceramic samples were prepared and studied by X-ray diffraction, scanning electron microscope, and electron probe microanalysis. In the range of 66.6 mol.% ZrO2, the solubility of Gd2O3 is 20–22.5 mol.% at 1600°C, and the binary intermediate phases Sm2Zr2O7 and Gd2Zr2O7 form a continuous solid solution at 1400°C. Using the experimental data as a foundation, thermodynamic modeling was performed using the approach. Based on the experimental data, the mixing parameters of fluorite, B and C phases were optimized, and thermodynamic modeling was performed using the CALPHAD (CALculation of PHAse Diagram) method. For the first time, a self-consistent database for Gd2O3-Sm2O3-ZrO2 ternary system was established.
Published Version
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