Stability and reliability of BaTiO3-based MLCCs with high dielectric by rare-earth doping: an insight from domain-engineering

Rare earth (RE)-doped BaTiO 3 materials are promising dielectric materials for base-metal electrode multilayer ceramic capacitors (BME-MLCCs). Thus, the fundamental understanding of their effect on dielectric properties and reliability is crucial for further improvement of its performance. Herein, according to Preisach model, the dielectric stability of Dy and Y-doped BaTiO 3 MLCCs with different particle sizes was investigated in this study. First order reversal curve (FORC) analysis showed that the reversible and irreversible domain wall motion of Dy-doped samples was weaker than that of Y-doped samples. Results also showed that the higher “shell” proportion of “core-shell” structure in Dy-doping was beneficial for improving the dielectric stability and insulation resistance degradation. The findings provide a comprehensive understanding and illustrate the significant role of the “core-shell” volume ratio in the tetragonality and domain wall motion in RE-doped BaTiO 3 materials, and consequently laying an important ground work to obtain high dielectric stability and reliability in BME-MLCCs.