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Issue 41, 2016, Issue in Progress
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Enhanced dielectric breakdown strength and energy storage density in lead-free relaxor ferroelectric ceramics prepared using transition liquid phase sintering

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Abstract

Lead-free relaxor ferroelectric ceramics have been widely explored for high power energy storage applications because of their high polarization saturation and low remnant polarization. However, lead-free relaxor ceramics with the bulk form exhibit low recoverable energy storage density (Wrec < 2 J cm−3) owing to low dielectric breakdown strength (DBS <200 kV cm−1). Here we use a strategy (the transition liquid phase sintering) to decrease the porosity and increase DBS of lead-free relaxor ferroelectric ceramics. This is achieved by introducing ZnO into 0.8(K0.5Na0.5)NbO3–0.2Sr(Sc0.5Nb0.5)O3 (0.8KNN–0.2SSN) ceramics. A dense microstructure (a low porosity) and submicron sized grains were found for 0.8KNN–0.2SSN–x mol%ZnO ceramics, which is responsible for a large DBS (400 kV cm−1). Both a large Wrec (2.6 J cm−3) and high energy storage efficiency (73.2%) were achieved for 0.8KNN–0.2SSN–0.5 mol%ZnO ceramics. The Wrec of 2.6 J cm−3 exceeds all the other reported results of lead-free bulk ceramics. The 0.8KNN–0.2SSN–0.5%ZnO ceramics are believed to be an attractive material for high power energy storage applications.

Graphical abstract: Enhanced dielectric breakdown strength and energy storage density in lead-free relaxor ferroelectric ceramics prepared using transition liquid phase sintering

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Publication details

The article was received on 22 Jan 2016, accepted on 29 Mar 2016 and first published on 31 Mar 2016


Article type: Paper
DOI: 10.1039/C6RA01919F
Citation: RSC Adv., 2016,6, 34381-34389

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    Enhanced dielectric breakdown strength and energy storage density in lead-free relaxor ferroelectric ceramics prepared using transition liquid phase sintering

    B. Qu, H. Du, Z. Yang, Q. Liu and T. Liu, RSC Adv., 2016, 6, 34381
    DOI: 10.1039/C6RA01919F

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