Polarity‐induced grain growth of gadolinium‐doped ceria under field‐assisted sintering technology/spark plasma sintering (FAST/SPS) conditions

This study aims to understand the effect of electrical field on microstructure evolution during field-assisted sintering or spark plasma (FAST/SPS) 10 mol% gadolinium-doped ceria (GDC) with experimental and numerical methods. The novelty this has been observation enhanced grain growth in region closer anode, even under FAST/SPS conditions fields less than 5 V/cm. kinetics, including determination activation energy grain-boundary mobility, were analyzed along cross section samples for different temperatures dwell periods. With an increase distance from reduction mobility was observed. These observations attributed attraction oxygen ions anode defects boundaries. Thereby larger grains that A homogenous observed a case where current did not flow through sample. Furthermore, strategy also developed simulate behavior addition heat generation, transfer, densification using Finite Element Methods (FEM) simulations. simulation results provided insight into presence potential difference across samples. good agreement observations.