W/UO₂ CERMET samples were sintered in a Spark Plasma Sintering (SPS) furnace at various temperature under vacuum and pressure. High Resolution Transmission Electron Microscopy (HRTEM) with Energy Dispersive Spectroscopy (EDS) was performed on the samples to determine interface structures and uranium diffusion from the UO₂ particles into the tungsten matrix. Local Electrode Atom Probe (LEAP) was also performed to determine stoichiometry of the UO₂ particles. It was seen that uranium diffused approximately 10–15 nm into the tungsten matrix. This is explained in terms of production of oxygen vacancies and Fick's law of diffusion.

中文翻译：

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火花等离子体烧结W / UO ₂陶瓷中的铀迁移

W / UO ₂ CERMET样品在火花等离子体烧结（SPS）炉中在各种温度，真空和压力下烧结。对样品进行了带能量色散光谱（EDS）的高分辨率透射电子显微镜（HRTEM），以确定界面结构和铀从UO ₂颗粒扩散到钨基体中的过程。还进行了局部电极原子探针（LEAP）以确定UO ₂颗粒的化学计量。可以看出，铀扩散到钨基体中约10-15 nm。这是根据氧空位的产生和菲克扩散定律来解释的。