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Effect of KNN substitution on the structural, electrical, and piezo characteristics of lead-free 0.94NBT–0.06SrTiO3 ceramics
Ist Teil von
Journal of materials science. Materials in electronics, 2024-04, Vol.35 (12), p.844
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2024
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
The conventional solid-state reaction approach was employed to develop 0.94NBT–0.06SrTiO
3
and 0.94NBT–0.06SrTiO
3
–KNN lead free electro ceramics. Both ceramics coexist in the rhombohedral structural phase (
R
3
c
) and tetragonal structural phase (
P
4
mm
) regions. When K
0.5
Na
0.5
NbO
3
(KNN) is introduced to 0.94Na
0.5
Bi
0.5
TiO
3
–0.06SrTiO
3
, the structure grows more symmetric without compromising electrical polarization. The surface morphology of both ceramics is measured by the average grain size, which is reduced somewhat from 3 to 2.6 μm, resulting in the influence of KNN. The composition-induced local structural transition—i.e., the change from order to disorder-occurs when KNN is added to the 0.94NBT–0.06SrTiO
3
binary system. Additionally, the depolarization temperature (
T
d
) increases substantially with the inclusion of KNN. When KNN is present, the coercive field (
E
c
) dramatically reduces from 32 to 21 kV/cm (~ Δ
E
= 11 kV/cm), without impairing the remaining remnant polarization (
P
r
). When compared to 0.94NBT–0.06SrTiO
3
, the substitution of KNN produces a high strain response of roughly 0.25% (under a mild field of 60 kV/cm). The longitudinal strain value of 140pC/N was determined parallelly. As a result, both of these lead-free ceramics are attractive prospects for next-generation electro ceramic applications.