|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||AA-10: Effects of β-decay on Ceramic Nuclear Waste Forms
||Kalie Knecht, Caitlin A Taylor, William J Weber, Maulik K Patel
|On-Site Speaker (Planned)
Pyrochlores (A2B2O7) have been researched extensively for their potential as candidate materials for the immobilization of actinides. Zirconate pyrochlore such as Nd2Zr2O7, where Nd acts as a surrogate for actinides like Am, are promising because they remain crystalline, even at very high doses of damage accumulation, while undergoing an order-disorder transformation. During the first several hundred years a waste form will primarily experience an elevated temperature state due to β-decay processes. Understanding dynamical thermal effects on structural modifications is therefore of fundamental importance. The present work details results of an <i>in-situ</i> high temperature x-ray diffraction (HTXRD) experiment and <i>ex-situ</i> scanning electron microscopy (SEM) to study crystallite size, grain size, structural modifications and strain development in Nd2Zr2O7. A rigorous analysis of the HTXRD patterns is performed to deduce the thermal expansion coefficient of Nd2Zr2O7.
||Planned: A print-only volume