Electric field enhancement of ceramics including microdefects

• DOI: 10.1111/jace.20690
• Publication Date: 2025-05-29T04:39:48Z
• Authors: Kaishi Matsunaga; Jin Araki; Yuki Nakashima; Manabu Fukushima; Kiyoshi Hirao; Norimitsu Murayama; Wataru Nakao

AbstractIn this study, a finite element analysis was performed to evaluate the effect of aspect ratios and dielectric constants of microdefects, such as pores, secondary phases, and grain boundary phases, on the electric field enhancement using the maximum field enhancement factor. For defect part with a lower dielectric constant than the solid part, including pores and secondary phases, as the aspect ratio of the defect part decreases (it becomes longer in the direction perpendicular to the electric field), the maximum electric field enhancement factor at the lateral surface of the defect part becomes higher. On the other hand, for defect part with a higher dielectric constant than the solid part, including grain boundary phases, the exact opposite behavior was observed. Moreover, it was also predicted that fine grain boundary phases act as a stronger electric field enhancement source than coarse pores.