Tuning enhanced dielectric properties of (Sc³⁺-Ta⁵⁺) substituted TiO₂ via insulating surface layers.

ABSTRACT: In this study, we achieved significantly enhanced giant dielectric properties (EG-DPs) in Sc³⁺-Ta⁵⁺ co-doped rutile-TiO₂ (STTO) ceramics with a low loss tangent (tanδ ≈ 0.05) and high dielectric permittivity (ε' ≈ 2.4 × 10⁴ at 1 kHz). We focused on investigating the influence of insulating surface layers on the nonlinear electrical properties and the giant dielectric response. Our experimental observations revealed that these properties are not directly correlated with the grain size of the ceramics. Furthermore, first-principles calculations indicated the preferred formation of complex defects, specifically 2Ta diamond and 2ScV_o triangular-shaped complexes, within the rutile structure of STTO; however, these too showed no correlation.

SUBMITTER: Tuichai W 

PROVIDER: S-EPMC10830478 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature