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http://dx.doi.org/10.4313/JKEM.2004.17.8.830

Piezoelectric Properties of Pb-free Bi(Na,K)TiO3-SrTiO3 Ceramics with the Amount of La2O3 Addition  

류주현 (세명대학교 전기공학과)
이현석 (세명대학교 전기공학)
박창엽 (세명대학교 전기공학)
정광현 (인하대학교 전기공학)
이덕출 (인하대학교 전기공학)
정영호 (한전전력연구)
홍재일 (동서울대학 전기정보제어과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.17, no.8, 2004 , pp. 830-834 More about this Journal
Abstract
In this study, lead-free pirzoelectric ceramics were investigated for pressure sensor applications as a function of the amount of ${La}_2{O}_3$ addition at $Bi(Na, K)Ti{O}_3-SrTi{O}_3$system. With increasing the amount of addition, the density and dielectric constant increased up to 0.9 wt% ${La}_2{O}_3$ addition and decreased above 0.9 wt% ${La}_2{O}_3$addition. Electromechanical coupling factor( $K_{P}$) showed the maximum value at 0.2 wt% ${La}_2{O}_3$addition and decreased above 0.2 wt% ${La}_2{O}_3$ addition. Electromechanical coupling $factor{(K)}_P$, density, dielectric constant$(\varepsilon_\Gamma)$, piezoelectric constant$(d_33)$ and curie temperature$(T_C)$ showed optimum value of 0.40, 5.75 g/㎤, 768, 215 pC/N and 320 $^{\circ}C$ at 0.2 wt%${La}_2{O}_3$addition, respectively.
Keywords
Pb-free ceramics; Piezoelectric constant$(d_33)$; Electromechanical coupling $factor{(K)}_P$; ${La}_2{O}_3$; ;
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