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Thermally Stable Piezoelectric Properties of (K, Na)NbO3-based Lead-free Perovskite with Rhombohedral-tetragonal Coexisting Phase

Author(s): Zhang, MH (Zhang, Mao-Hua); Wang, K (Wang, Ke); Zhou, JS (Zhou, Jin-Song); Zhou, JJ (Zhou, Jia-Jun); Chu, XC (Chu, Xiangcheng); Lv, X (Lv, Xiang); Wu, JG (Wu, Jiagang); Li, JF (Li, Jing-Feng)
Source: ACTA MATERIALIA  Volume: 122  Pages: 344-351  DOI: 10.1016/j.actamat.2016.10.011  Published: JAN 1 2017 
Abstract: A feasible replacement for lead-based piezoelectric ceramics is desperately required for increasing environmental concerns. Benefiting from the construction of a rhombohedral-tetragonal (R-T) phase boundary, a potential lead-free candidate (Na0.5K0.5)NbO3-(Bi0.5Li0.5)TiO3-BaZrO3 is presented in this study, with a large piezoelectric coefficient d(33) of 330 pC/N and a unipolar strain of 0.16% at 4 kV/mm. More importantly, the piezoresponse is extremely thermally stable that the strain can maintain a considerable value of 0.12% at the temperature as high as 190 degrees C, rendering the current system very promising for piezoelectric actuator applications. The temperature dependent phase structure evolution as well as piezoelectric response is investigated systematically for interpretation of underlying mechanisms. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
IDS Number: EE4EY
ISSN: 1359-6454
eISSN: 1873-2453

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