Effect of KNN substitution on the structural, electrical, and piezo characteristics of lead-free 0.94NBT–0.06SrTiO3 ceramics.
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| Title: | Effect of KNN substitution on the structural, electrical, and piezo characteristics of lead-free 0.94NBT–0.06SrTiO |
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| Authors: | Rao, Nalamala Srinivasa1 (AUTHOR), Srikanth, B.1 (AUTHOR), Anjaneyulu, T.2 (AUTHOR), Mohan Babu, P.3 (AUTHOR), Bhaskaraiah, M.4 (AUTHOR), Lakshmi, K. N. V.5 (AUTHOR), Babu, Kuppam Mohan6 (AUTHOR) mohan.kuppam@svcolleges.edu.in |
| Source: | Journal of Materials Science: Materials in Electronics. Apr2024, Vol. 35 Issue 12, p1-8. 8p. |
| Abstract: | The conventional solid-state reaction approach was employed to develop 0.94NBT–0.06SrTiO3 and 0.94NBT–0.06SrTiO3–KNN lead free electro ceramics. Both ceramics coexist in the rhombohedral structural phase (R3c) and tetragonal structural phase (P4mm) regions. When K0.5Na0.5NbO3 (KNN) is introduced to 0.94Na0.5Bi0.5TiO3–0.06SrTiO3, 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–0.06SrTiO3 binary system. Additionally, the depolarization temperature (Td) increases substantially with the inclusion of KNN. When KNN is present, the coercive field (Ec) dramatically reduces from 32 to 21 kV/cm (~ ΔE = 11 kV/cm), without impairing the remaining remnant polarization (Pr). When compared to 0.94NBT–0.06SrTiO3, 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The conventional solid-state reaction approach was employed to develop 0.94NBT–0.06SrTiO3 and 0.94NBT–0.06SrTiO3–KNN lead free electro ceramics. Both ceramics coexist in the rhombohedral structural phase (R3c) and tetragonal structural phase (P4mm) regions. When K0.5Na0.5NbO3 (KNN) is introduced to 0.94Na0.5Bi0.5TiO3–0.06SrTiO3, 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–0.06SrTiO3 binary system. Additionally, the depolarization temperature (Td) increases substantially with the inclusion of KNN. When KNN is present, the coercive field (Ec) dramatically reduces from 32 to 21 kV/cm (~ ΔE = 11 kV/cm), without impairing the remaining remnant polarization (Pr). When compared to 0.94NBT–0.06SrTiO3, 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09574522 |
| DOI: | 10.1007/s10854-024-12611-7 |
