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(Ba,Sr)TiO 3 –Bi(Mg,Hf)O 3 Lead-Free Ceramic Capacitors with High Energy Density and Energy Efficiency by Kong, Xi; Yang, Letao; Cheng, Zhenxiang; Liang, Gemeng; Zhang, Shujun is a Engineering article available to read on EtoBox.

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Dielectric capacitors with high energy storage performance have been actively studied for emerging applications. In this work, a series of environmental friendly lead-free relaxor ferroelectric ceramics, (1x)(Ba 0.75 Sr 0.25 )TiO 3 -xBi(Mg 0.5 Hf 0.5 )O 3 with 0 ≤ x ≤ 0.5 [abbreviated as (1x)BST-xBMH], were synthesized by a high-temperature solid-state reaction method. The perovskite structure without any secondary phase can be obtained in samples with x ≤ 0.4. As the BMH content increases, the polarization-electric field (P-E) loop becomes slim and slanted. A large recoverable energy storage density of 4.3 J/cm 3 and high energy efficiency of 92% were achieved simultaneously in 0.6BST-0.4BMH at 390 kV/cm. The fine grain morphology with minimal porosity and the high conductivity activation energy were responsible for the enhanced breakdown strength. Of particular importance is that the 0.6BST-0.4BMH ceramic shows excellent temperature stability and cycling reliability with energy density variations below 3 and 4%, respectively. In addition, the 0.6BST-0.4BMH ceramic possesses fast discharge time (∼0.59 μs) with a high power density of 3.5 MW/cm 3 . All these merits reveal that the

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Author

Kong, Xi; Yang, Letao; Cheng, Zhenxiang; Liang, Gemeng; Zhang, Shujun

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 2574-0962)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)