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http://dx.doi.org/10.4313/JKEM.2010.23.10.771

Piezoelectric and Dielectric Properties of NKN-(1-x)BNT-xBT Ceramics  

Lee, Seung-Hwan (Department of Electronic Materials Engineering, Kwangwoon University)
Nam, Sung-Pill (Department of Ceramic Engineering, Gyeongsang National University)
Lee, Sung-Gap (Department of Ceramic Engineering, Gyeongsang National University)
Lee, Young-Hie (Department of Electronic Materials Engineering, Kwangwoon University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.23, no.10, 2010 , pp. 771-775 More about this Journal
Abstract
In this study, piezoelectric and dielectric properties of the $(Na_{0.5}K_{0.5})NbO_3-(1-x)(Bi_{0.5}Na_{0.5})TiO_3-xBaTiO_3$ [NKN-(1-x)BNT-xBT] ceramics were investigated. The lead-free NKN-(1-x)BNT-xBT ceramics were fabricated by a conventional mixed oxide method. The results indicate that the addition of $BaTiO_3$ significantly influences the sintering, microstructure, phase transition and electrical properties of NKN-BNT ceramics. A gradual change in the piezoelectric and dielectric properties was observed with the increase of BT contents. The dielectric constant, piezoelectric constant ($d_{33}$) and electromechanical coupling factor ($k_p$) increased at the morphotropic phase boundary (MPB). The $d_{33}$=184 pC/N, $k_p$=0.38, dielectric constant=1455 with dielectric loss value of less than 1% were obtained for the NKN-0.95BNT-0.05BT ceramics sintered at $1150^{\circ}C$ for 2h. These results demonstrate that the NKN-(1-x)BNT-xBT ceramics is an attractive candidate for lead-free piezoelectric materials.
Keywords
Piezoelectric properties; Dielectric properties; NKN-BNT-BT; Lead-free; MPB;
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