| Autor: |
Saha, Manish, Cho, Phyu Phyu, Subrahmanyam, Ch., Niranjan, Manish K., Asthana, Saket |
| Zdroj: |
Journal of Materials Science: Materials in Electronics; Nov2023, Vol. 34 Issue 33, p1-19, 19p |
| Abstrakt: |
The comprehensive study on the impact of different synthesis techniques on the structural, electrical, and photocatalytic properties of perovskite ferroelectric ceramics K 0.5 Na 0.5 NbO 3 (KNN). The solid-state reaction and hydrothermal methods are used to prepare the KNN ceramics, and the effects of grain size on the physical characteristics these ceramics are examined. The KNN-S prepared by solid-state method have significantly larger grain size as compared to that for KNN-H prepared by hydrothermal method. Furthermore, the KNN-S is found to exhibit higher dielectric, piezoelectric and ferroelectric properties as compared to KNN-H. On the other hand, the increased photocatalytic activity is observed in KNN-H as compared to KNN-S. As compared to the hydrothermal synthesis, the solid-state synthesis causes an increase in the relative dielectric permittivity ϵ ′ from 2394 to 3286, remnant polarization P r from 15.38 to 20.41 μ C/ cm 2 , planer electromechanical coupling factor k p from 0.19 to 0.28 and piezoelectric coefficient d 33 from 88 to 125 pC/N. The KNN-S ceramics are also found to have a lower leakage current density, and higher grain resistance than KNN-H ceramic. The enhanced photocatalytic activity of KNN-H is attributed to relatively smaller particle sizes. The KNN-S and KNN-H samples are found to have degradation efficiencies of RhB solution of 20% and 65%, respectively. The study highlights the importance of synthesis methods and how these can be exploited to tailor the dielectric, piezoelectric and photocatalytic properties of KNN. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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