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Phase-composition dependent domain responses in (K0.5Na0.5)NbO3-based piezoceramics

Journal Article


Abstract


  • Lead-free (K0.5Na0.5)NbO3-based (KNN) piezoceramics featuring a polymorphic phase boundary (PPB) between the orthorhombic and tetragonal phases at room temperature are reported to possess high piezoelectric properties but with inferior cycling stability, while the ceramics with a single tetragonal phase show improved cycling stability but with lower piezoelectric coefficients. In this work, electric biasing in-situ transmission electron microscopy (TEM) study is conducted on two KNN-based compositions, which are respectively at and off PPB. Our observations reveal the distinctive domain responses in these two ceramics under cyclic fields. The higher domain wall density in the poled KNN at PPB contributes to the high piezoelectric properties. Upon cycling, however, a new microstructure feature, ���domain intersection���, is directly observed in this PPB composition. In comparison, the off-PPB KNN ceramic develops large domains during poling, which experience much less extent of disruption during cycling. Our comparative study provides the basis for understanding the relation between phase composition and piezoelectric performance.

Publication Date


  • 2020

Citation


  • Fan, Z., Zhang, S., & Tan, X. (2020). Phase-composition dependent domain responses in (K0.5Na0.5)NbO3-based piezoceramics. Journal of the European Ceramic Society, 40(4), 1217-1222. doi:10.1016/j.jeurceramsoc.2019.11.046

Scopus Eid


  • 2-s2.0-85078668246

Start Page


  • 1217

End Page


  • 1222

Volume


  • 40

Issue


  • 4

Place Of Publication


Abstract


  • Lead-free (K0.5Na0.5)NbO3-based (KNN) piezoceramics featuring a polymorphic phase boundary (PPB) between the orthorhombic and tetragonal phases at room temperature are reported to possess high piezoelectric properties but with inferior cycling stability, while the ceramics with a single tetragonal phase show improved cycling stability but with lower piezoelectric coefficients. In this work, electric biasing in-situ transmission electron microscopy (TEM) study is conducted on two KNN-based compositions, which are respectively at and off PPB. Our observations reveal the distinctive domain responses in these two ceramics under cyclic fields. The higher domain wall density in the poled KNN at PPB contributes to the high piezoelectric properties. Upon cycling, however, a new microstructure feature, ���domain intersection���, is directly observed in this PPB composition. In comparison, the off-PPB KNN ceramic develops large domains during poling, which experience much less extent of disruption during cycling. Our comparative study provides the basis for understanding the relation between phase composition and piezoelectric performance.

Publication Date


  • 2020

Citation


  • Fan, Z., Zhang, S., & Tan, X. (2020). Phase-composition dependent domain responses in (K0.5Na0.5)NbO3-based piezoceramics. Journal of the European Ceramic Society, 40(4), 1217-1222. doi:10.1016/j.jeurceramsoc.2019.11.046

Scopus Eid


  • 2-s2.0-85078668246

Start Page


  • 1217

End Page


  • 1222

Volume


  • 40

Issue


  • 4

Place Of Publication