Achievement of high electric performances for bismuth titanate-based piezoceramics via hot press sintering

Bi4Ti3O12 (BIT) ceramic has great potential in high-temperature environment due to its high Curie temperature TC ~ 675 °C. In this work, hot press sintering (HPS) is applied on the 0.01 mol Ce and Nb/Cr co-doped BIT (BCTNC) ceramics to enhancing the low piezoelectric coefficient (d33 < 7 pC/N) an...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2022-12, Vol.42 (15), p.6968-6976
Main Authors: Shi, Wei, Guan, Shangyi, Li, Xu, Xing, Jie, Zhang, Feifei, Chen, Ning, Wu, YuTong, Xu, Hongfei, Xu, Yugen, Chen, Qiang
Format: Article
Language:English
Subjects:
Anisotropic ceramics
Bi4Ti3O12
Domain structure
Hot press sintering
Piezoelectricity
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Summary:Bi4Ti3O12 (BIT) ceramic has great potential in high-temperature environment due to its high Curie temperature TC ~ 675 °C. In this work, hot press sintering (HPS) is applied on the 0.01 mol Ce and Nb/Cr co-doped BIT (BCTNC) ceramics to enhancing the low piezoelectric coefficient (d33 < 7 pC/N) and resistivity. Extremely high d33 (~39 pC/N) together with high TC (~672 °C) and high dc resistivity ρ (~1.49 ×107Ω∙cm at 500 °C) are obtained in HPS samples. The enhancement of piezoelectricity benefits from high density of domain and high poling electric field. Moreover, outstanding thermal stability of piezoelectric constant (d33 ~ 35 pC/N after annealing at 650 °C) and low dielectric loss (tanδ ~ 3.8% at 500 °C) are observed as well. These findings are instrumental in understanding HPS and provide a possible manipulation of crystallized mechanism and domains growing kinetics to enhance piezoelectric performances of BIT based ceramics.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2022.07.023