X-ray and thermal investigations of [(U0.2Th0.8)1−yDyy]O2+x; 0 ≤ y ≤ 0.37

Thermogravimetric study of [(U0.2Th0.8)1−yDyy]O2+x; y = 0 to 0.27 in air showed single step oxidation and retain the fluorite structure. High temperature X-ray diffraction (HTXRD) study of [(U0.2Th0.8)1−yDyy]O2+x showed positive thermal expansion between 298 and 1273 K. The specific heat capacities of these solid solutions, measured using differential scanning calorimetry from 300 to 850 K, showed decreasing trend with increasing Dy content.