Microstructure and thermal properties of dysprosium and thulium co-doped barium titanate ceramics for high performance multilayer ceramic capacitors

► Dy/Tm co-doping method in BaTiO3 was suggested to improve electrical properties and temperature stability simultaneously. ► We examined these properties in terms of microstructural analysis and substitution rate. ► Increase of Dy2O3 addition enhanced dielectric constant. ► Increase of Tm2O3 addition enhanced temperature stability. ► Improved electrical properties and temperature stability through Dy/Tm co-doping were deduced from formation of electrons and core-shell structure.