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http://dx.doi.org/10.4313/JKEM.2013.26.2.104

Dielectric and Piezoelectric Properties of 0.95(Na0.5K0.5)0.04[(Nb0.8Ta0.20)0.994Co0.015]O3-0.05KNbO3 Ceramics as a Function of Calcination Temperature  

Park, Min-Ho (Department of Electrical Engineering, Semyung University)
Lee, Kab-Soo (Department of Electrical Engineering, Semyung University)
Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University)
Jeong, Woy-Seung (Institute of Health Industry, Chungbuk Health & Science University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.26, no.2, 2013 , pp. 104-108 More about this Journal
Abstract
In this paper, the $0.95(Na_{0.5}K_{0.5})_{0.04}[(Nb_{0.8}Ta_{0.20})_{0.994}Co_{0.015}]O_3$(abbreviated as NKNT) + $0.05KNbO_3$ lead-free piezoelectric ceramics were synthesized by the conventional mixed oxide method route with normal sintering. And also, the effects of calcination temperature on the microstructure, dielectric properties, and piezoelectric properties were investigated. A polymorphic phase transition(PPT) between orthorhombic and tetragonal phases was observed in specimens calcined at $810^{\circ}C{\sim}850^{\circ}C$. The ceramics calcined at $830^{\circ}C$ showed excellent piezoelectric properties: $d_{33}$= 179 pC/N, $k_p$= 0.384, $Q_m$= 79.73). These results indicate that the ceramic is a promising candidate material for lead-free piezoelectric ceramics.
Keywords
Lead-free; Piezoelectric properties; Calcinations temperature; NKN;
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