|About this Abstract
|MS&T23: Materials Science & Technology
|Ceramics for New Generation Nuclear Energy System Application
|Decoding the Structural Descriptors Controlling Nepheline Crystallization in Borosilicate-based Nuclear Waste Glasses
|Ashutosh Goel, Ambar Deshkar, Yingcheng Zhang, Ping Lu, Randall Youngman, Jinjun Ren, Pierre Florian, Jiri Brus, Gregory Tricot, Alfonso Pedone
|On-Site Speaker (Planned)
Nepheline (Na2O•Al2O3•2SiO2) crystallization during cooling of borosilicate-based glass melt removes three moles of glass-forming oxides per mole of Na2O, thus impacting the chemical durability of the final waste form severely. Several models have been proposed to predict the propensity of nepheline crystallization in waste glasses. However, owing to their empirical nature, these models (1) are conservative in terms of waste loading, (2) are prone to make false-positive predictions, and (3) do not allow the design of novel glass compositions with enhanced waste loading. Therefore, it is imperative to establish the connections between chemo-structural drivers controlling nepheline crystallization in borosilicate glasses that can be used to develop QSPR-based predictive models. The presentation will focus on elucidating these relationships in various model nuclear waste glass systems and discussing their impact on the future development of predictive models.