[15p-D215-1~9] 9.1 Dielectrics, ferroelectrics

[15p-D215-6] Ferroelectric design utilizing defect dipoles

〇Yuji Noguchi¹, Hiroki Matsuo¹ (1.Kumamoto Univ.)

Keywords:ferroelectric, polarization, DFT

We report a ferrorestorable polarization engineering capable of enhancing effective permittivity over twice. Our experiments and ab initio calculations demonstrate that a defect dipole composed of Cu³⁺ and oxygen vacancy in a prototypical ferroelectric BaTiO₃ ceramic is coupled with spontaneous polarization. The resultant ferrorestorable polarization delivers an extraordinarily large effective relative permittivity beyond 7,000 with a high energy efficiency up to 89 %. Our work paves the way to realizing efficient ceramic capacitors for self-powered applications.