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Lead-free (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 (KNLNST) piezoelectric ceramics are synthesized by the conventional solid-state reaction method. The sintering temperature and poling temperature dependence of ceramic properties are investigated. Previous studies have shown that variation of sintering temperature can cause phase transition, similar to the morphotropic phase boundary (MPB) behavior induced by composition changes in Pb(Zr,Ti)O3 (PZT). And the best piezoelectric performance can be obtained near the phase-transition sintering temperature. In this research, phase transition induced by sintering temperature cannot be detected and excellent piezoelectric properties can still be obtained. The sintering temperature of the largest piezoelectric coefficient of such composition is lower than that of the highest density, which is considered in composition segregation as a result of intensified volatilization of alkali metal oxides. Combined with the effect of poling temperature, the peak values of the piezoelectric properties are d33 = 313 pC/N, kp = 47%, εr = 1825, tanδ = 0.024, To–t = 88 ℃, and TC = 274 ℃.


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Influence of sintering temperature on electrical properties of (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 ceramics without phase transition induced by sintering temperature

Show Author's information Shaohua QIANKongjun ZHU*( )Xuming PANGJing WANGJinsong LIUJinhao QIU
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Abstract

Lead-free (K0.4425Na0.52Li0.0375)(Nb0.8825Sb0.07Ta0.0475)O3 (KNLNST) piezoelectric ceramics are synthesized by the conventional solid-state reaction method. The sintering temperature and poling temperature dependence of ceramic properties are investigated. Previous studies have shown that variation of sintering temperature can cause phase transition, similar to the morphotropic phase boundary (MPB) behavior induced by composition changes in Pb(Zr,Ti)O3 (PZT). And the best piezoelectric performance can be obtained near the phase-transition sintering temperature. In this research, phase transition induced by sintering temperature cannot be detected and excellent piezoelectric properties can still be obtained. The sintering temperature of the largest piezoelectric coefficient of such composition is lower than that of the highest density, which is considered in composition segregation as a result of intensified volatilization of alkali metal oxides. Combined with the effect of poling temperature, the peak values of the piezoelectric properties are d33 = 313 pC/N, kp = 47%, εr = 1825, tanδ = 0.024, To–t = 88 ℃, and TC = 274 ℃.

Keywords:

tetragonal, piezoelectric properties, sintering temperature, doped, poling temperature
Received: 12 July 2013 Revised: 30 August 2013 Accepted: 07 September 2013 Published: 04 December 2013 Issue date: December 2013
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Publication history
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Publication history

Received: 12 July 2013
Revised: 30 August 2013
Accepted: 07 September 2013
Published: 04 December 2013
Issue date: December 2013

Copyright

© The author(s) 2013

Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 51172108), and the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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