Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 15, Pages 19189-19196Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.06.166
Keywords
Barium titanate; Relaxor ferroelectrics; Cold isostatic pressing; Energy storage; Capacitors
Categories
Funding
- National Natural Science Foundation of China [51672226, 51502248, 51402243, U1504525]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0356]
- Fundamental Research Funds for the Central Universities [XDJK2017D013, XDJK20188009, XDJK2018C002]
- National College Student innovation and Entrepreneurship Program of Southwest University [201810635001]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE19209]
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In order to fabricate high performance dielectric capacitors for pulsed power applications, dense and homogenous Bi(Mg2/3Nb1/3)O-3-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 0.875BaTiO(3)-0.125Bi(Mg2/3Nb1/3)O-3 (BT-0.125BMN). Good energy storage properties including a high recoverable energy density of similar to 1.89 J/cm(3), an relatively high efficiency of similar to 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.
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