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

By Gang Liu, Yang Li, Mengqi Shi, Linjiang Yu, Peng Chen, Kun Yu, Yan Yan, Li Jin, Dawei Wang, Jinghui Gao. Ceramics International, 2019

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Abstract In order to fabricate high performance dielectric capacitors for pulsed power applications, dense and homogenous Bi(Mg 2/3 Nb 1/3 )O 3 -modifed BaTiO 3 -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(Mg 2/3 Nb 1/3 )O 3 (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 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.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/0dceb3bedd8b231e9114e5503e3c8d9a69da722a