Enhanced piezoelectric performance in Na0.5Bi4.5Ti4O15‐based bismuth‐layered ceramics by Nb/Mn doping modification

In this work, Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y bismuth‐layered ferroelectric ceramics were prepared by a solid‐state reaction method. The effect of Nb5+ content on crystal morphology, electrical properties, and piezoelectric performance were systematically investigated. The results show that the int...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2023-04, Vol.106 (4), p.2466-2475
Main Authors: Mo, Wen, Luo, Xin, Zhang, Yangyang, Niu, Huiyan, Fang, Ziyan, Hu, Liangwei, Liu, Kun, Li, Qifan, Chen, Yong, Shen, Meng
Format: Article
Language:English
Subjects:
Bismuth
bismuth‐layered Na0.5Bi4.5Ti4O15
B‐site doping
Ceramics
Curie temperature
Dipoles
Electrical properties
Ferroelectric materials
Ferroelectricity
high Curie temperature
Manganese
Niobium
piezoelectric properties
Piezoelectricity
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Summary:In this work, Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y bismuth‐layered ferroelectric ceramics were prepared by a solid‐state reaction method. The effect of Nb5+ content on crystal morphology, electrical properties, and piezoelectric performance were systematically investigated. The results show that the introduction of Nb5+ into Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y ceramics to replace Ti4+ increases the ratio of b/a lattice parameter, leading to the TiO6 octahedral distortion and the structural transformation tendency from the orthorhombic to tetragonal phase, which facilitates dipole movements of Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y ceramics. Therefore, the ferroelectric properties of Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y ceramics are improved, and an enhanced piezoelectric coefficient of 30 pC/N combining great temperature stability with d33 value higher than 25 pC/N in the temperature range of 25°C–450°C has been realized in Na0.5Bi4.5Ti3.94–xMn0.06NbxO15+y ceramics with x = 0.08 mol. Our work provides a good model for designing lead‐free ultrahigh Curie temperature piezoelectric devices that can be practically applied in extremely harsh environments.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18952