| International Journal of Advanced Applied Physics Research (Volume 2 Issue 2) |
| Defect-Structure-Related Ferroelectric Properties of K0.5Na0.5NbO3 Lead-Free Piezoelectric Ceramics |
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Pages 35-39
Shanming Ke, Manfang Mai, Tao Li, Mao Ye, Peng Lin, Xierong Zeng, L.M. Zhou, Y.W. Mai and Haitao Huang
DOI: http://dx.doi.org/10.15379/2408-977X.2015.02.02.6
Published: 18 December 2015 |
| Abstract |
| Lead-free piezoelectric ceramics K0.5Na0.5NbO3 (KNN) doped with Cu, Fe, and Ni have been prepared by a conventional ceramic process. The results reveal that Cu-doped KNN ceramic exhibits double-loop-like characteristics, while Fe & Ni-doped KNN ceramics show normal single loops. EPR spectra verified the formation of irreversible defect complex (DC1) and (DC2) in Cu-doped ceramics, while defect complexes were observed in Fe-doped ceramics and very small defect complex signal in Ni-doped ceramics. The experimental results show that the ferroelectric properties of KNN ceramics are strongly related to these defect structures. |
| Keywords |
| Defect complex, K0.5Na0.5NbO3, EPR, Ferroelectric polarization, KNN ceramics. |
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