Excellent thermal stability, high efficiency and high power density of (Sr0.7Ba0.3)5LaNb7Ti3O30–based tungsten bronze ceramics. Issue 6 (June 2020)

• Record Type: Journal Article
• Authors: Cao, Lei; Yuan, Ying; Tang, Bin; Li, Enzhu; Zhang, Shuren
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 6(2020)
• Page Start: 2366
• Page End: 2374
• Publication Date: 2020-06
• Subjects: Tungsten bronze -- Thermal stability -- Charge-discharge -- Energy storage; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.01.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A series of (1- x )(Sr0.7 Ba0.3 )5 LaNb7 Ti3 O30 – x (Bi0.5 Na0.5 )TiO3 ( x = 0.1–0.4) ceramics with tungsten bronze structure were prepared by solid state reaction. Phase composition, microstructure and energy storage properties were studied. When x = 0.3, excellent thermal stability satisfying the X7R specification was obtained and its energy storage as well as charge-discharge performances were further evaluated. Release energy density (Wre ) of 0.77 J/cm 3 and an energy storage efficiency of 97.3 % were detected at a low electric field of 20 kV/mm. Under the electric field of 10 kV/mm, the change of Wre in the temperature range of −55 °C to 125 °C is less than 15 % compared to room temperature. Short discharge period (∼0.17 μs), high power density (61.2 MW/cm 3 ) and high discharge energy density (2.45 J/cm 3 ) were evaluated by charge-discharge tests. Excellent thermal stability, high energy storage efficiency and high power density indicate that 0.7(Sr0.7 Ba0.3 )5 LaNb7 Ti3 O30 –0.3(Bi0.5 Na0.5 )TiO3 ceramic is a promising pulse capacitor for working over a wide temperature range.