Improved energy storage in antiferroelectric AgNbO3-modulated 0.925Bi0.5Na0.5TiO3 – 0.075BaTiO3 relaxor ferroelectric ceramics. Issue 23 (1st December 2022)

• Record Type: Journal Article
• Authors: Chen, Cheng-Sao; Lin, Zong-Qi; Montecillo, Rhys; Liao, Jhao-Yuan; Chen, Pin-Yi; Tu, Chi-Shun
• Is Part Of: Ceramics international. Volume 48:Issue 23(2022)Part A
• Page Start: 35452
• Page End: 35460
• Publication Date: 2022-12-01
• Subjects: 0.925Bi0.5Na0.5TiO3-0.075BaTiO3 -- Antiferroelectric AgNbO3 -- Recoverable energy density -- Energy-storage efficiency -- Power density -- Temperature coefficient of capacitance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.148
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this report, antiferroelectric AgNbO3 -modified (1- x )(0.925Bi0.5 Na0.5 TiO3 -0.075BaTiO3 )- x AgNbO3 ( x = 0–0.2) relaxor-ferroelectric ceramics were studied to optimize energy density and storage efficiency. Dielectric properties and microstructure were analyzed to explore the influence of antiferroelectric AgNbO3 (AN) in energy-storage performance of 0.925Bi0.5 Na0.5 TiO3 -0.075BaTiO3 (BNBT) ceramics. By substituting proper AN concentrations ( x ≤ 0.15), dielectric breakdown strength ( BDS ) can be effectively increased, while remanent polarization ( P r ) and coercive field ( E c ) were evidently reduced. The optimal recoverable energy density ( W rec ) of 3.92 J/cm 3 and storage efficiency ( η ) of 70% are respectively achieved for x = 0.1 (at E = 180 kV/cm) and x = 0.05 (at E = 110 kV/cm). Temperature-dependent dielectric permittivities show that 0.1∼0.15 AN-doped BNBT ceramics maintain low dielectric losses (tan δ < 0.1%) with a stable temperature coefficient of capacitance ( TCC ), which meets the X7R specification. This work demonstrates that antiferroelectric AN-doped BNBT relaxor-ferroelectric ceramics are suitable for using in high-density energy storage.