Crystal structure, relaxor behaviors and energy storage performance of (Sr0.7Ba0.3)5LaNb7Ti3O30 tungsten bronze ceramics. Issue 5 (1st April 2020)

• Record Type: Journal Article
• Authors: Cao, Lei; Yuan, Ying; Yang, Zhengyi; Li, Enzhu; Zhang, Shuren
• Is Part Of: Ceramics international. Volume 46:Issue 5(2020)
• Page Start: 6108
• Page End: 6114
• Publication Date: 2020-04-01
• Subjects: Tetragonal tungsten bronze -- Impedance -- Dielectric breakdown strength -- Energy storage; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.073
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, a new (Sr0.7 Ba0.3 )5 LaNb7 Ti3 O30 system ceramic with a filled tetragonal tungsten bronze structure was proposed and fabricated by the traditional solid phase method. Crystal structure, relaxor behaviors and energy storage capabilities were studied. Large relaxor activation energy indicates a "weakly coupled relaxor" mechanism, which is advantageous for obtaining better energy storage performance, and lower conductance activation energy can further prove the formation of the filled tungsten bronze structure. More importantly, a dielectric breakdown strength of up to 35.5 kV/mm was obtained. The releasable energy density and efficiency at 24 kV/mm are 1.36J/cm 3 and 91.9%, respectively. In addition, due to the high current density and high dielectric breakdown strength, a current density of 477.5 A/cm 2 and a power density of 42.9 MW/cm 3 are achieved, meaning that SBLNT ceramic is a potential candidate dielectric ceramic for energy storage.