Controlled colossal polarization originating in the Li-ion conductor–dielectric interface

Abstract

A novel colossal polarization architecture generated at the fast Li-ion conductor–dielectric interface is proposed. A fast Li-ion conductor, La0.57Li0.29TiO3 (LLT), is utilized as the conductive core material, while the ferroelectric barium titanate (BaTiO3; BT) was coated onto the LLT as the shell layer via a liquid phase reaction. After densification of the composites, the shell BT fully transforms into the interdiffusion layer, i.e. (Ba, Li, La)TiO3 (BLLT). The BLLT effectively hinders Li diffusion, leading to a colossal polarization at the core–shell interface. Consequently, the optimized BT–LLT achieves dielectric characteristics at 1 kHz with permittivity of 3.28 × 104.

Polarization at the compositional interface in Nb-doped metastable TiO2-SnO2 solid solutions

“…Compared with ionic displacements and domain-wall oscillations in conventional ferroelectrics, the permittivity due to the interfacial effect that accompanies such long-distance carrier transportation is much larger, with ε r generally exceeding 10 4-5 . [24][25][26][27] Long charge migration to interfaces, however, results in large dielectric loss. [25][26][27] Extensive research related to paraelectric rutile TiO 2 -based BL capacitors has been published.…”

“…[24][25][26][27] Long charge migration to interfaces, however, results in large dielectric loss. [25][26][27] Extensive research related to paraelectric rutile TiO 2 -based BL capacitors has been published. [28][29][30] Electronpinned defect dipoles deliver a polarization caused by localized electrons introduced into the TiO 2 lattice.…”