1. Enhanced breakdown strength of Al2O3-modified Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ferroelectric ceramics with core–shell structure.
- Author
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Wang, Junxia, Wang, Genshui, Wang, Jin, Chen, Xuefeng, Nie, Hengchang, Cao, Fei, and Dong, Xianlin
- Subjects
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FERROELECTRIC ceramics , *STRENGTH of materials , *ELECTRIC breakdown , *ALUMINUM oxide , *LEAD compounds , *CITRATES , *CRYSTAL grain boundaries - Abstract
The Al 2 O 3 -modified Pb 0.99 (Zr 0.95 Ti 0.05 ) 0.98 Nb 0.02 O 3 (PZT 95/5) ferroelectric ceramics with enhanced breakdown strength were prepared from PZT 95/5 powders coated with a thin Al 2 O 3 shell layer, which were fabricated by a Citrate-Chelation method followed by a conventional sintering process. The microstructure and electrical properties of the as-prepared ceramics as a function of Al 2 O 3 content were systematically investigated. The results reveal that Al 2 O 3 nanoparticles are successfully coated on PZT 95/5 powders to form the core–shell structure and well dispersed at the grain boundaries of the PZT 95/5 ceramic matrix after sintering, which strengthened the grain boundaries. In particular, compared with pure PZT 95/5 ferroelectric ceramics, PZT 95/5 ceramics with less than 1.0 wt% Al 2 O 3 inclusion possess the enhanced breakdown strength and energy density, of which the largest increment being 25.9% and 13.5%, respectively. It is indicated that the as-prepared PZT 95/5 ferroelectric ceramics may be a promising candidate for explosively driven power supply. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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