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(1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 (KNN–xBLZ, x = 0–0.06) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, and their phase structures and electric properties as well as TC were systematically investigated. The orthorhombic–tetragonal (O–T) two phases were detected in all (1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 ceramics at 0.01 ≤ x ≤ 0.05. Due to the appropriate ratio between O phase and T phase ( CO/CT = 45/55), high piezoelectric properties of d33 = 239 pC/N, kp = 34%, and Pr = 25.23 μC/cm2 were obtained at x = 0.04. Moreover, a high TC = 348 ℃ was also achieved in KNN–xBLZ ceramic at x = 0.04. These results indicate that (1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 system is a promising candidate for high-temperature piezoelectric devices.


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Multi-phase structure and electrical properties of Bi0.5Li0.5ZrO3 doping K0.48Na0.56NbO3 lead-free piezoelectric ceramics

Show Author's information Xiaoyan PENGa,bBoping ZHANGa( )Lifeng ZHUaLei ZHAOcRuixiao MAaBo LIUaXiaodong WANGa
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
New Metallurgy Hi-Tech Group Co., Ltd., China Iron & Steel Research Institute Group, Beijing 100081, China
Hebei Key Lab of Optic-Electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China

Abstract

(1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 (KNN–xBLZ, x = 0–0.06) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, and their phase structures and electric properties as well as TC were systematically investigated. The orthorhombic–tetragonal (O–T) two phases were detected in all (1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 ceramics at 0.01 ≤ x ≤ 0.05. Due to the appropriate ratio between O phase and T phase ( CO/CT = 45/55), high piezoelectric properties of d33 = 239 pC/N, kp = 34%, and Pr = 25.23 μC/cm2 were obtained at x = 0.04. Moreover, a high TC = 348 ℃ was also achieved in KNN–xBLZ ceramic at x = 0.04. These results indicate that (1–x)K0.48Na0.56NbO3xBi0.5Li0.5ZrO3 system is a promising candidate for high-temperature piezoelectric devices.

Keywords:

lead-free piezoelectric ceramics, potassium–sodium niobate (KNN), solid-state sintering, multi-phase, electrical properties
Received: 07 November 2017 Revised: 13 January 2018 Accepted: 14 January 2018 Published: 12 February 2018 Issue date: March 2018
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Publication history

Received: 07 November 2017
Revised: 13 January 2018
Accepted: 14 January 2018
Published: 12 February 2018
Issue date: March 2018

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© The author(s) 2018

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