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Ultrahigh piezoelectric performances of (K,Na)NbO3 based ceramics enabled by structural flexibility and grain orientation
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Ultrahigh piezoelectric performances of (K,Na)NbO3 based ceramics enabled by structural flexibility and grain orientation
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Journal Article
Ultrahigh piezoelectric performances of (K,Na)NbO3 based ceramics enabled by structural flexibility and grain orientation
2025
Overview
(K,Na)NbO
3
-based ceramics are deemed among the most promising lead-free piezoelectric materials, though their overall piezoelectric performance still lags behind the mainstream lead-containing counterparts. Here, we achieve an ultrahigh piezoelectric charge coefficient d
33
∼ 807 pC·N
−1
, along with a high longitudinal electromechanical coupling factor (k
33
∼ 88%) and Curie temperature (T
c
∼ 245 °C) in the (K,Na)(Nb
1-
x
Sb
x
)O
3
-Bi
0.5
Na
0.5
ZrO
3
-BiFeO
3
(KNN-
x
Sb) system through structural flexibility and grain orientation strategies. Phenomenological models, phase field simulations and high-angle annular dark-field scanning transmission electron microscopy reveal that the structural flexibility originates from the high Coulomb force between K
+
/Na
+
ions and Sb ions in the KNN-
x
Sb system, while the grain orientation promotes the displacement of B-site cations leveraging the engineered domain configuration. As a result of its excellent comprehensive piezoelectric properties, the textured KNN-5Sb/epoxy 1-3 piezoelectric composite is found to possess a broader bandwidth BW = 60% and higher amplitude output voltage than commercial PZT-5 and other KNN counterparts. These findings suggest that the textured KNN-5Sb ceramics could potentially replace current lead-based piezoceramics in transducer applications.
The authors achieve piezoelectric coefficient
d
33
∼ 807 pC·N
−1
, along with high
k
33
∼ 88 % and
T
c
∼ 245 °C in (K,Na)(Nb
1-
x
Sb
x
)O
3
-Bi
0.5
Na
0.5
ZrO
3
-BiFeO
3
system through structural flexibility and grain orientation strategies.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
