An investigation of the dielectric energy storage performance of Bi(Mg2/3Nb1/3)O3-modifed BaTiO3 Pb-free bulk ceramics with improved temperature/frequency stability. Issue 15 (15th October 2019)

• Record Type: Journal Article
• Authors: Liu, Gang; Li, Yang; Shi, Mengqi; Yu, Linjiang; Chen, Peng; Yu, Kun; Yan, Yan; Jin, Li; Wang, Dawei; Gao, Jinghui
• Is Part Of: Ceramics international. Volume 45:Issue 15(2019)
• Page Start: 19189
• Page End: 19196
• Publication Date: 2019-10-15
• Subjects: Barium titanate -- Relaxor ferroelectrics -- Cold isostatic pressing -- Energy storage -- Capacitors; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.06.166
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In order to fabricate high performance dielectric capacitors for pulsed power applications, dense and homogenous Bi(Mg2/3 Nb1/3 )O3 -modifed BaTiO3 -based Pb-free relaxor ferroelectric ceramics were obtained through a isostatic pressing technique at room temperature. Obvious relaxor behavior with a high diffusion degree is confirmed by broad and frequency-dependent dielectric peaks in 0.875BaTiO3 -0.125Bi(Mg2/3 Nb1/3 )O3 (BT-0.125BMN). Good energy storage properties including a high recoverable energy density of ∼1.89 J/cm 3, an relatively high efficiency of ∼83%, good dielectric/temperature/frequency dependent stability and also fatigue resistance are achieved in this composition at a high electric field of 240 kV/cm, together with a fast discharging speed of <160 nm and high maximum current density of 503.46 A/cm 2 and a large power density of 25.12 MW/cm 3 . These properties indicate that BT-0.125BMN is a promising candidate of capacitors for the pulsed power applications.