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Title: Defect-Structure-Related Ferroelectric Properties of K0.5Na0.5NbO3 Lead-Free Piezoelectric Ceramics
Authors: Shanming Ke, Manfang Mai, Tao Li, Mao Ye, Peng Lin, Xierong Zeng, L.M. Zhou, Y.W. Mai, Haitao Huang
Journal: International journal of advanced applied physics research
Publisher: Cosmos Scholars Publishing House
Year: 2015
Volume: 2
Issue: 2
Language: en
DOI: 10.15379/2408-977X.2015.02.02.6
Keywords: EPRDefect complexK0.5Na0.5NbO3Ferroelectric polarizationKNN ceramics
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.
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