High dielectric performance and multifarious polarizations in (Lu + Ta) co-doped TiO2 ceramics. Issue 3 (3rd July 2021)

• Record Type: Journal Article
• Authors: Fan, Jiangtao; Long, Zhen; Hu, Zhanggui
• Is Part Of: Journal of Asian ceramic societies. Volume 9:Issue 3(2021)
• Page Start: 1255
• Page End: 1264
• Publication Date: 2021-07-03
• Subjects: Colossal permittivity -- electronic materials -- polarization -- defect clusters; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1080/21870764.2021.1966919
• Languages: English
• ISSNs: 2187-0764

Abstract

ABSTRACT: Materials with high dielectric constant have broad application prospects in energy storage elements. In this work, (Lu0.5 Ta0.5 )x Ti1-x O2 ceramics (x = 0, 0.01, 0.02 and 0.04) were synthesized by a standard conventional solid-state reaction. Remarkably, (Lu0.5 Ta0.5 )0.01 Ti0.99 O2 ceramic exhibits a high dielectric permittivity (2.55 × 10 4 ), low dielectric loss (0.012) and excellent stabilities of frequency and temperature (−150–150°C and 20–5 × 10 6 Hz). The formation mechanism of excellent dielectric properties was studied based on analysis of the XRD, SEM, XPS, complex impedance and electric modulus. Colossal permittivity (CP) and low tan δ were attributed to the internal barrier layer capacitance (IBLC) effect, electron-pinned defect-dipole (EPDD) effect and electrode effect. This work has important guidance for the further research of giant dielectric materials.