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Detailed Program
Paper Number : LP-O05
Time Frame : 14:45~14:57
Presentation Date : Friday, 28, November
Session Name : Leadfree Piezoelectrics
Session Chair 1# : Soon-Jong Jeong
Session Chair 2# : Hiroyuki Shimizu
Performance Stabilized Lead-free Piezoelectric Ceramics: (Li, Na, K)(Nb, Ta)O3 Modified by BaZrO3
Fangyuan ZHU
Tsinghua University
Keywords: Lead-free, Sodium Potassium Niobates, Piezoelectric Ceramics

Lead zirconate titanate (PZT) has been dominated commercial manufacturing over several decades to become the market-leading piezoelectric ceramic. Legislation arising from health and environmental concerns has intensified research into finding suitable alternatives to lead-based electroceramics. Solid solutions based on sodium potassium niobates (K, Na)NbO3 (shorten as KNN) has become one of the global-desired lead-free piezoelectric ceramics in nowadays due to its superior dielectric and piezoelectric properties.

LiTaO3 doped to the perovskite KNN structure (KNNLT) would adjust Na/K ratio, which enhances the piezoelectric properties and significantly lowers the orthorhombic to tetragonal phase transition (TO-T) to the room temperature. Whereas it introduces the coexistence of O/T phase and promotes the piezoelectric response. Also, KNNLT-BaZrO3 (KNNLT-BZ) solid-solution system has been reported to have the optimal piezoelectric charge coefficient about 340-360 pC/N and high level of unipolar strain up to 0.16% at ambient temperature. Most interesting part for the KNNLT-BZ piezoceramics is the temperature stability of field-induced strain under a wide range of temperatures. The effect of BaZrO3 addition on the piezoelectric response has been studied, which piezoelectric properties suggested it could be one of possible candidates for actuator application design purpose.
Acknowledgements : Authors would like to appreciate the funding and kindly support by the National Nature Science Foundation of China (Grants No. 51332002).