Electromechanical properties and cycling stability of low-temperature co-fired BNT–ST multilayer piezoactuators
Low-temperature co-fired Bi 0.5 Na 0.5 TiO 3 –SrTiO 3 (BNT–ST)/Ag–Pd lead-free multilayer piezoactuators (MLAs) with a large strain and excellent cycling stability were fabricated by tape casting for practical applications. Adding CuO decreased the sintering temperature of (1 − x )BNT– x ST + 0.05...
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Published in | Journal of materials science. Materials in electronics Vol. 33; no. 27; pp. 21482 - 21496 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.09.2022
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Low-temperature co-fired Bi
0.5
Na
0.5
TiO
3
–SrTiO
3
(BNT–ST)/Ag–Pd lead-free multilayer piezoactuators (MLAs) with a large strain and excellent cycling stability were fabricated by tape casting for practical applications. Adding CuO decreased the sintering temperature of (1 −
x
)BNT–
x
ST + 0.05 wt% MnO
2
(BNST100
x
) ceramics from 1190 °C to 960 °C. A BNST25.5 ceramic with 1.2 wt% CuO outputs a large normalized strain (950 pm/V) under an ultra-low driving field (2 kV/mm). Through optimizing the material composition and ceramic layer thickness, a normalized strain of 760 pm/V at 2.5 kV/mm is realized in a BNST24 with 1.2 wt% CuO MLA with a 63 μm single-layer thickness. Fairly good cycling stability is achieved with only ∼5% reduction after 10
7
cycles at 4 kV/mm. At the same time, these MLAs could still deliver over 85% strain at 80 °C. A MLA prototype with commercial size outputs a total strain of 0.112% and a blocking stress of 35.4 MPa at 2.5 kV/mm, demonstrating a better performance than that of traditional commercial lead zirconate titanate (PZT) actuators. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-022-08939-7 |