Effect of Bi(Li0.5Nb0.5)O3 addition on structural, dielectric, and energy storage properties of Na0.5Bi0.5TiO3-BaZrO3 lead-free ceramics

• Published in: Journal of materials science. Materials in electronics 2021-08, Vol.32 (15), p.20342-20350
• Main Authors: Cao, Wenjun, Li, Tianyu, Chen, Pengfei, Wang, Chunchang
• Format: Article
• Language: English
• Subjects: Barium zirconates; Bismuth titanate; Capacitors; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dielectric properties; Energy storage; Lead free; Materials Science; Optical and Electronic Materials; Pore size; Stability
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-06542-w

Lead-free dielectric ceramic capacitors have wide applications in pulsed power systems due to their high power density. In this study, (0.95- x )Na 0.5 Bi 0.5 TiO 3 -0.05BaZrO 3 - x Bi(Li 0.5 Nb 0.5 )O 3 (BNT-BZ- x BLN) ceramics were successfully prepared by solid-state methods, and their structural, dielectric, and energy storage properties were systematically investigated. The introduction of Bi(Li 0.5 Nb 0.5 )O 3 leads to dense microstructure and small pore size. The stability of dielectric properties can be significantly enhanced by Bi(Li 0.5 Nb 0.5 )O 3 modification. A high and stable dielectric permittivity of 2382 ( Δ ε ′ / ε 150 ∘ C ′ ≤ ± 15 % ) over a wide temperature range of 103–450 °C (@1 kHz) was achieved in NBT-BZ-0.03BLN ceramic. Meanwhile, this sample also shows a maximum energy storage density of 1.59 J/cm 3 featured with good temperature stability from 20 to 140 °C. In addition, a large current density (581 A/cm 2 ), high power density (29 MW/cm 3 ) and fast charge–discharge speed (41 ns) are also obtained in the NBT-BZ-0.03BLN ceramic. Our results indicate that the BNT-BZ- x BLN system would be promising lead-free materials for pulsed power capacitors.