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Large recoverable energy storage density and low sintering temperature in potassium‐sodium niobate‐based ceramics for multilayer pulsed power capacitors
Author(s) -
Qu Bingyue,
Du Hongliang,
Yang Zetian,
Liu Qinghui
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14728
Subject(s) - sintering , materials science , ceramic , capacitor , dielectric , ceramic capacitor , energy storage , potassium niobate , pulsed power , power density , analytical chemistry (journal) , mineralogy , composite material , ferroelectricity , optoelectronics , electrical engineering , power (physics) , chemistry , voltage , thermodynamics , physics , engineering , chromatography
Multilayer pulsed power ceramic capacitors require that dielectric ceramics possess not only large recoverable energy storage density ( W rec ) but also low sintering temperature (<950°C) for using the inexpensive metals as the electrodes. However, lead‐free bulk ceramics usually show low W rec (<2 J/cm 3 ) and high sintering temperature (>1150°C), limiting their applications in multilayer pulsed power ceramic capacitors. In this work, large W rec (~4.02 J/cm 3 at 400 kV/cm) and low sintering temperature (940°C) are simultaneously achieved in 0.9(K 0.5 Na 0.5 )NbO 3 –0.1Bi(Mg 2/3 Nb 1/3 )O 3 –1.0 mol% CuO ceramics prepared using transition liquid phase sintering. W rec of 4.02 J/cm 3 is 2‐3 times as large as the reported value of other (Bi 0.5 Na 0.5 )TiO 3 and BaTiO 3 ‐based lead‐free bulk ceramics. The results reveal that 0.9(K 0.5 Na 0.5 )NbO 3 –0.1Bi(Mg 2/3 Nb 1/3 )O 3 –1.0 mol% CuO ceramics are promising candidates for fabricating multilayer pulsed power ceramic capacitors.