Excellent Dielectric and Optical Properties of Bapr2ti4o12 Synthesized by Solid-Phase Reaction

Abstract

The tungsten-bronze-type BaPr2Ti4O12 ceramic, synthesized through a solid-phase reaction, shows impressive high permittivity and ultra-low dielectric loss across a wide range of temperatures and frequencies. Its dielectric properties remain stable between room temperature and 250°C due to fixed carriers in defect clusters, while heat-activated electrons above 250°C cause significant changes. High grain boundary impedance of BaPr2Ti4O12 ceramics results in the low electrical conductivity and consequently the extremely low dielectric loss. Besides, a theoretical model based on hysteretic elasticity theory has been proposed to successfully explain the relaxation dynamics observed in BaPr2Ti4O12. Additionally, BaPr2Ti4O12 ceramic exhibits excellent optical absorption in visible light due to its suitable bandgap of 1.95 eV and shows remarkable fluorescence because of the rare-earth Pr ion.

Keywords: Dielectric ceramic, Electrical property, Optical property, fluorescent property