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Eggeman, Alexander
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Publications (7/7 displayed)
- 2024Understanding Ag liquid migration in SiC through ex-situ and in-situ Ag-Pd/SiC interaction studiescitations
- 2021Influence of Twin Boundaries and Sample Dimensions on the Mechanical Behavior of Ag Nanowires
- 2020The structure of a new nano-phase of lanthanum-doped strontium titanatecitations
- 2019Dispersoid Composition in Zirconium Containing Al-Zn-Mg-Cu (AA7010) Aluminium Alloycitations
- 2019Self-Nanostructuring in SrTiO3
- 2019Self-Nanostructuring in SrTiO 3 :A Novel Strategy for Enhancement of Thermoelectric Response in Oxides
- 2008Synthesis and single-particle optical detection of low-polydispersity plasmonic-superparamagnetic nanoparticlescitations
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article
Understanding Ag liquid migration in SiC through ex-situ and in-situ Ag-Pd/SiC interaction studies
Abstract
The effective containment of fission products (FPs) within tri-structural isotropic (TRISO) fuel particles is crucial for the safety and efficiency of High Temperature Gas-cooled Reactors (HTGRs). Combining multi-scale (µm to nm) and multi-dimensional (2D and 3D) analysis, this study focuses on the migration mechanisms of silver (Ag), for which the Ag-110 m FP isotope is radiotoxic, facilitated by reactions with palladium (Pd) alloys and the silicon carbide (SiC) layer at elevated temperatures (1300–1500 °C). Three primary pathways for Ag migration are identified: (1) diffusion in solid palladium silicide to form (Pd,Ag)<sub>2</sub>Si, (2) infiltration through cracks and pores in the carbon phase, and (3) liquid phase migration along SiC grain boundaries. Especially at temperatures above the melting point of Pd<sub>2</sub>Si (1404 °C), a ‘dissolution-recrystallisation’ mechanism is proposed of the Ag-Pd-Si liquid phase migrating along SiC grain boundaries. The study employs state-of-the-art in-situ heating transmission electron microscopy (TEM) techniques to directly observe the dynamic migration processes of Pd silicide within SiC, providing unprecedented insights into the liquid behaviour in TRISO fuel. These findings highlight the significant role of liquid phases in determining the transport of FPs through the TRISO-SiC which is vital for developing strategies that enhance the safety and efficacy of HTGRs.