|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Surprisingly High Irradiation-induced Defect Mobility in Fe3O4 as Revealed through In Situ Transmission Electron Microscopy
||Djamel Kaoumi, Martin Owusu-Mensah, Angelica Lopez Morales, Kayla Yano, Tiffany Kaspar, Daniel Schreiber, Blas Uberuaga
|On-Site Speaker (Planned)
While radiation-enhanced diffusion is a well know phenomenon, ceramics have often been considered to be more resilient to radiation, with some simulation studies suggesting an inherent difficulty to form stable dislocation loops. However recent ion irradiations of Metal/Oxide (e.g. Fe/Fe3O4) heterostructures done in-situ in a TEM showed enhanced mobility of defects in the ceramic part more so than the metal part. Indeed, it was shown that much higher defect mobility induced in the ceramic led to quicker defect loss to sinks and lower density of visible loops in the oxide compared with the metal Fe. The question of radiation-enhanced diffusivity of defects in ceramics is not as “straightforward” as in metals due to the nature of the defects being charged. We provide a thorough discussion of the current models including ionization induced diffusion (IID) and electro-migration and how our experiments question or support them.