Lead-free X8R-type 0.92Ba0.8Sr0.2TiO3-0.08Bi(Mg0.5Zr0.5)O3 dielectric energy-storage ceramics for pulsed power capacitors

• Published in: Journal of materials science 2023-07, Vol.58 (28), p.11761-11770
• Main Authors: Li, Tianyu, Yang, Xianfeng, Xie, Aiwen, Jiang, Xuewen, Rahman, Attaur, Zhang, Yi, Zuo, Ruzhong
• Format: Article
• Language: English
• Subjects: Capacitors; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Composition; Crystallography and Scattering Methods; dielectric properties; Energy; Energy Materials; Energy storage; Ferroelectric domains; Ferroelectricity; Lead free; Materials Science; Polymer Sciences; Solid Mechanics; temperature
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-023-08742-7

Dielectric ceramic capacitors, as one kind of important electrical energy-storage device, have been widely used because of their high-power density and low cost. It is a key challenge and of great significance to develop dielectric ceramic capacitors with high energy-storage density within a wide operate temperature range. In this work, the effect of the Bi(Mg 0.5 Zr 0.5 )O 3 addition on the dielectric and energy-storage properties of lead-free Ba 0.8 Sr 0.2 TiO 3 ceramics was systematically studied. It can be found that with increasing Bi(Mg 0.5 Zr 0.5 )O 3 content, an increase in dielectric temperature stability as a result of the addition of Bi(Mg 0.5 Zr 0.5 )O 3 can accompany the formation of the long-range ordered ferroelectric domain into polar nanoregions and also conform to a decrease in remanent polarization and an increase in energy-storage properties. As a result, for the composition 0.92Ba 0.8 Sr 0.2 TiO 3 -0.08Bi(Mg 0.5 Zr 0.5 )O 3 , a stable dielectric constant in a temperature range of −100–151 °C was achieved. Furthermore, a large recoverable energy-storage density value (3.44 J/cm 3 ) and a high-power density value (541 MW/cm 3 ) were obtained simultaneously in the above ceramic composition. All these features suggest that the 0.92Ba 0.8 Sr 0.2 TiO 3 -0.08Bi(Mg 0.5 Zr 0.5 )O 3 ceramics might be ideal materials for potential applications of high energy-storage capacitors.