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http://dx.doi.org/10.4313/JKEM.2011.24.7.563

Sintering of ZrO2-modified 0.96(K0.5Na0.5)NbO3-0.04SrZrO3 Piezoelectric Ceramics in a Reduced Atmosphere  

Kang, Kyung-Min (Korea Institute of Ceramic Engineering and Technology)
Cho, Jeong-Ho (Korea Institute of Ceramic Engineering and Technology)
Nam, Joong-Hee (Korea Institute of Ceramic Engineering and Technology)
Ko, Tae-Gyung (Department of Ceramic Engineering, Inha University)
Chun, Myoung-Pyo (Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.7, 2011 , pp. 563-567 More about this Journal
Abstract
The most widely used piezoelectric ceramics are lead oxide based ferroelectrics (PZT). However, the toxicity of lead oxide and its high vapor pressure during processing have led to a demand for alternative lead-free piezoelectric materials. We synthesized Lead-free piezoelectric ceramics of $0.96(K_{0.5}Na_{0.5})NbO_3-0.04SrZrO_3+x$ mol% $ZrO_2$ [KNN-SZ+$xZrO_2$; x= 0~0.10] doped with 0.1 wt% $MnO_2$ by a conventional solid state method. We investigated the piezoelectric properties and microstructures of these disk samples sintered in reduced atmosphere in order to evaluate the possibility of the multilayered piezoelectric ceramics having the base metal such as Ni as a internal electrode. All of these KNN-SZ samples sintered in 3%$H_2-97%N_2$ atmosphere at $1,140^{\circ}C$ exhibit pure perovskite structure irrespective of the content of $ZrO_2$. Meanwhile, the sintering denisty and piezoelectric properties such as $K_p$, $Q_m$ and $d_{33}$ of KNN-SZ samples as a function of $ZrO_2$ content show the maxima ($k_p$=28.07%, $Q_m$= 101.34, $d_{33}$= 156 pC/N) at x= 0.04 and it is likely that there is some morphotropic phase boundary(MPB) in this KNN-SZ+$xZrO_2$ composition system. These results indicate that the ceramic composition is a promising candidate material for applications in lead free multilayer piezoelectric ceramics.
Keywords
Lead-free; $(K_{0.5}Na_{0.5})NbO_3$; Reduced atmosphere; Piezoelectric;
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