Structure and Dielectric Energy Storage Properties of Secondary Phase CaCu3Ti4O12 Modified BSBNT Relaxor Ferroelectric Ceramics
Abstract
(Ba0.3Sr0.7)0.35(Bi0.5Na0.5)0.65TiO3-xwt%CaCu3Ti4O12 (BSBNT-xwt%CCTO, in which x=5, 10, 15, 20) ceramics were prepared by a solid-state reaction method. The effect of CCTO content on the phase structure, microstructure and electrical properties was investigated. The ceramics possess a coexistence of BSBNT and CCTO phases when x≤15, while a few CuxOy phase can be detected when x=20. The grain size of ceramics decreases significantly corresponding good density after CCTO addition. Meanwhile, the dielectric peak becomes broadened, the temperature stability TCC150 ℃ is enhanced, and the dielectric constant and loss also display good frequency stability. As CCTO content increases, the P-E loops of BSBNT-xwt%CCTO ceramics gradually transform to “slim” type. For BSBNT-10wt%CCTO ceramics, the optimized energy density Wrec=0.72 J/cm3 is achieved with an efficiency η=63.4% under an electric field of E=80 kV/cm, which can be used for pulsed power capacitors fabrication.
Keywords
References
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