Enhanced physical properties of Bi4Ti3O12 modified Bi0.5(Na0.4K0.1)TiO3 lead-free piezoelectric ceramics using crystallographic orientation techniques

In this study, bismuth titanate (Bi 4 Ti 3 O 12 ) templates were synthesized through the molten salt method in Na 2 CO 3 and K 2 CO 3 fluxes. The prepared Bi 4 Ti 3 O 12 templates possessed plate-like morphologies with lengths of 5–20 μm and widths of 0.5–1 μm. They can be used to improve the electr...

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Bibliographic Details
Published in:Journal of electroceramics 2020-04, Vol.44 (1-2), p.68-77
Main Authors: Le, Dai Vuong, Dao, Anh Quang
Format: Article
Language:English
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Summary:In this study, bismuth titanate (Bi 4 Ti 3 O 12 ) templates were synthesized through the molten salt method in Na 2 CO 3 and K 2 CO 3 fluxes. The prepared Bi 4 Ti 3 O 12 templates possessed plate-like morphologies with lengths of 5–20 μm and widths of 0.5–1 μm. They can be used to improve the electrical properties of Bi 0.5 (Na 0.4 K 0.1 )TiO 3 lead-free ceramics by employing template grain growth method at different sintering temperatures (950–1150 °C). The effect of sintering temperature on the physical properties of the 0.9[Bi 0.5 (Na 0.4 K 0.1 )TiO 3 ]-0.1[Bi 4 Ti 3 O 12 ] (BNKT-BT) ceramics was investigated and it was found that the degree of orientation of the synthesized ceramics increased along with the sintering temperature, and the highest values were achieved at 1050 ο C. However, at 1150 ο C, the values for both ceramics started to decrease due to the formation of the Bi 2 Ti 2 O 7 pyrochlore phase. The ceramics sintered at an optimum temperature of 1050 ο C exhibited the best physical properties such as density ( ρ ), 6.0 g cm −3 (relative density 99.8% of the theoretical value); remanent polarization ( P r ), 15.5 μC cm −2 ; coercive field ( E c ), 24.5 Kv/cm; and highest dielectric constant ( ε max ), 6080.
ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-020-00200-z