Large Piezoelectric Strain with Superior Thermal Stability and Excellent Fatigue Resistance of Lead-free Potassium Sodium Niobate-Based Grain Orientation-Controlled Ceramics.

Author(s) Quan, Y.; Ren, W.; Niu, G.; Wang, L.; Zhao, J.Yan; Zhang, N.; Liu, M.; Ye, Z.G.; Liu, L.; Karakit, T.
Journal ACS Appl Mater Interfaces
Date Published 2018 Mar 07

Environment-friendly lead-free piezoelectric materials with high piezoelectric response which is stable in a wide temperature range are urgently needed for various applications. In this work, grain orientation-controlled (with a 90% <001>c-oriented texture) (K,Na)NbO3 (KNN)-based ceramics with large piezoelectric response (d33*) = 505 pm V-1 and a high Curie temperature (TC) of 247 oC have been developed. Such a high d33* value varies by less than 5% from 30 oC to 180 oC, showing a superior thermal stability. Furthermore, the high piezoelectricity exhibits an excellent fatigue resistance with the d33* value decreasing within only by 6% at a field of 20 kV cm-1 up to 107 cycles. These exceptional properties can be attributed to the vertical morphotropic phase boundary (MPB) and the highly <001>c-oriented textured ceramic microstructure. These results open a pathway to promote lead-free piezoelectric ceramics as a viable alternative to lead-based piezoceramics for various practical applications, such as actuators, transducers, sensors and acoustic devices in a wide temperature range.

DOI 10.1021/acsami.8b01554
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2018.

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