Abebe, G and Jafo, G and Adhikary, GD and De, GD and Ranjan, R and Mishra, A (2020) Microstructural, structural, dielectric, piezoelectric and energy storage properties of 0.2 wt% MnO2 doped (0.94-x)Na0.5Bi0.5TiO3–0.06BaTiO3-xK0.5Na0.5NbO3 ceramics (0 ≤ x ≤ 0.08). In: SN Applied Sciences, 2 (12).
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Abstract
Lead free (0.94-x)Na0.5Bi0.5TiO3–0.06BaTiO3-xK0.5Na0.5NbO3 ceramics are under the spotlight owing to their multifunctional nature. We have systematically investigated the microstructural, structural, dielectric, piezoelectric and energy storage properties of the system in the range 0 ≤ x ≤ 0.08. There is a systematic reduction in grain size with increasing K0.5Na0.5NbO3(KNN) concentration. The enhancement in disorder with K0.5Na0.5NbO3(KNN) doping is evident from the increase in slope of the dielectric dispersion plots. The unpoled compositions have a cubic like structure in the whole range i.e. from x = 0 to x = 0.08. However, the application of electric field(poling) results in a structural transformation to lower symmetry upto x = 0.04. Beyond that the disorder dominates over the applied electric field and the structure is cubic like even in the poled state. The energy storage density increases from 0.08 J/cm3 for x = 0 to 1.19 J/cm3 for x = 0.05 and saturates thereafter. Discharge efficiency also follows a similar trend. The piezoresponse decreases with KNN doping from 151 pC/N for x = 0 to 4 pC/N for x = 0.08. It is observed that energy storage density and piezoresponse are complimentary properties which increase at the expense of each other. © 2020, Springer Nature Switzerland AG.
| Item Type: | Journal Article |
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| Publication: | SN Applied Sciences |
| Publisher: | Springer Nature |
| Additional Information: | The copyright for this article belongs to the Author(s). |
| Keywords: | Bismuth compounds; Electric discharges; Energy storage; Manganese oxide; Piezoelectricity; Titanium compounds, Discharge efficiency; Energy storage density; Energy storage properties; Grain size; Micro-structural; Na0.5Bi0.5TiO3; Piezoresponse; Structural transformation, Sodium compounds |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 09 Jan 2023 11:55 |
| Last Modified: | 09 Jan 2023 11:55 |
| URI: | https://eprints.iisc.ac.in/id/eprint/78959 |
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