Electric-Field-Induced Increase in Permittivity in Uniaxial Antiferroelectric K ₃ Nb ₃ B ₂ O ₁₂ Polycrystalline Ceramics

Potassium niobate borate K₃Nb₃B₂O₁₂ exhibits uniaxial antiferroelectricity, where polarization flipping occurs along only one crystallographic direction, while a linear dielectric response is observed in perpendicular directions. The present study investigates the temperature dependence of dielectric permittivity and electric-field-induced polarization of K₃Nb₃B₂O₁₂ polycrystalline ceramics to clarify its potential for high-voltage applications. The results demonstrated a high relative permittivity of approximately 130 at room temperature and its enhancement under an applied electric field. Notably, the onset electric field for permittivity boosting was found to be markedly smaller than that observed in typical uniaxial antiferroelectrics. This study paves the way for the development of next-generation capacitors for power electronics with uniaxial antiferroelectricity.