Investigating the structure and thermal stability of Nd_xY_yZr_1-x-yO_2-δ inert matrix fuel materials

Cubic zirconia (ZrO₂) is ideal for use as inert matrix fuel but is not stable at room temperature. It is well known that adding small amounts of Y³⁺ can stabilize the cubic structure, though little research has been done to understand how these materials change when actinides are doped into the system. Here, a series of Nd_xY_yZr_1-x-yO_2-δ compounds have been investigated using powder X-ray diffraction and X-ray absorption spectroscopy. (Nd was used as a surrogate for Am.) The results show that the addition of Y³⁺ to the Nd_xZr_1-xO₂ system increases the thermal stability of these materials. (author)