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(K,Na)NbO3-based ceramics for piezoelectric "hard" lead-free materials

Journal Article


Abstract


  • Lead-free piezoelectric ceramics (K0.45Na0.55) NbO3 (KNN) modified by K4CuNb8O23 (KCN) were synthesized using conventional ceramic processing. All the ceramics possessed the perovskite structure with orthorhombic symmetry. Results revealed that the addition of KCN was effective in enhancing the density of KNN. The addition of KCN was found to slightly decrease To-t and T c. The coercive field (Ec) was found to maintain the same value by the addition of KCN while the internal bias (Ei) sharply increased to 4 kV/cm with 0.5 mol% KCN. The low migration rate of defect dipoles was correlated with the build-up of Ei, which was responsible for the stabilization of the domain wall and the improvement of Qm. Therefore, KNN-KCN0.5 exhibited excellent piezoelectric properties of d 33 (100 pC/N), kp (33%), and Qm (1500), making them promising candidates for applications requiring hard piezoelectrics. �� 2010 The American Ceramic Society.

Publication Date


  • 2010

Citation


  • Lim, J. B., Zhang, S., Jeon, J. H., & Shrout, T. R. (2010). (K,Na)NbO3-based ceramics for piezoelectric "hard" lead-free materials. Journal of the American Ceramic Society, 93(5), 1218-1220. doi:10.1111/j.1551-2916.2009.03528.x

Scopus Eid


  • 2-s2.0-77951670071

Start Page


  • 1218

End Page


  • 1220

Volume


  • 93

Issue


  • 5

Place Of Publication


Abstract


  • Lead-free piezoelectric ceramics (K0.45Na0.55) NbO3 (KNN) modified by K4CuNb8O23 (KCN) were synthesized using conventional ceramic processing. All the ceramics possessed the perovskite structure with orthorhombic symmetry. Results revealed that the addition of KCN was effective in enhancing the density of KNN. The addition of KCN was found to slightly decrease To-t and T c. The coercive field (Ec) was found to maintain the same value by the addition of KCN while the internal bias (Ei) sharply increased to 4 kV/cm with 0.5 mol% KCN. The low migration rate of defect dipoles was correlated with the build-up of Ei, which was responsible for the stabilization of the domain wall and the improvement of Qm. Therefore, KNN-KCN0.5 exhibited excellent piezoelectric properties of d 33 (100 pC/N), kp (33%), and Qm (1500), making them promising candidates for applications requiring hard piezoelectrics. �� 2010 The American Ceramic Society.

Publication Date


  • 2010

Citation


  • Lim, J. B., Zhang, S., Jeon, J. H., & Shrout, T. R. (2010). (K,Na)NbO3-based ceramics for piezoelectric "hard" lead-free materials. Journal of the American Ceramic Society, 93(5), 1218-1220. doi:10.1111/j.1551-2916.2009.03528.x

Scopus Eid


  • 2-s2.0-77951670071

Start Page


  • 1218

End Page


  • 1220

Volume


  • 93

Issue


  • 5

Place Of Publication