MATEC Web Conf.
Volume 119, 2017The Fifth International Multi-Conference on Engineering and Technology Innovation 2016 (IMETI 2016)
|Number of page(s)||7|
|Published online||04 August 2017|
Effect of sintering condition on the microstructure and electrical properties of lead-free (Na0.5K0.5)NbO3 - Bi0.5(Na0.83K0.17)0.5TiO3 ceramics
1 Department of Electronic Engineering, Nan-Jeon University, Tainan City 737, Taiwan
2 Graduate School of Engineering Science and Technology, Nan-Jeon University, Tainan City 737, Taiwan
a Corresponding author : email@example.com
In this work, the piezoelectric ceramic system of the (1-x)(Na0.5K0.5)NbO3 - xBi(Na0.83K0.17)TiO3 with composition close to the morphotropic phase boundary is studied. (Na0.5K0.5)NbO3 with 0∼5 mole% Bi(Na0.83K0.17)TiO3 has been prepared following the conventional mixed oxide process. The effect of sintering time on the properties of 0.97(Na0.5K0.5)NbO3-0.03Bi(Na0.83K0.17)TiO3 ceramics is discussed. For 0.97(Na0.5K0.5)NbO3-0.03Bi(Na0.83K0.17)TiO3 ceramics, the electromechanical coupling coefficients of the thickness mode kt and the piezoelectric constant d33 reach 0.46 and 155 p/CN, respectively, at the sintering of 1100 °C for 3 h. Dielectric and piezoelectric properties have maximum values at the sintering temperature of 1100 °C for 5 h. For 0.97(Na0.5K0.5)NbO3 -0.03Bi(Na0.83K0.17)TiO3 ceramics, the electromechanical coupling coefficients of the thickness mode kt and the piezoelectric constant d33 reach 0.56 and 190, respectively, at the sintering of 1100 °C for 5 h. The effect of prolonging the sintering time to the 0.97(Na0.5K0.5)NbO3-0.03Bi(Na0.83K0.17)TiO3 system is a helpful method on ceramic processing to improve densification and properties.
© The Authors, published by EDP Sciences, 2017
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