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http://dx.doi.org/10.4313/JKEM.2009.22.6.484

Dielectric and Piezoelectric Properties of (Na,K)$NbO3 Ceramics as a Function of SrTiO3 Substitution  

Lee, Sang-Ho (세명대학교 전기공학과)
Yoo, Ju-Hyun (세명대학교 전기공학과)
Lee, Yeu-Yong (세명대학교 전기공학과)
Song, Hyun-Seon (세명대학교 전기공학과)
Mah, Suk-Burm (용인송담대학 조명인테리어과)
Kim, Seong-Goo (삼성전자 반도체총괄)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.22, no.6, 2009 , pp. 484-488 More about this Journal
Abstract
In this study, in order to develop the lead-free piezoelectric ceramics with high piezoelectric and dielectric properties, $[(K_{0.5}Na_{0.5})_{0.95}Li_{0.05}(Nb_{0.96}Sb_{0.04})]O_3$ ceramics were fabricated using $Ag_2O$ as sintering aid and a conventional mixed oxide process and their piezoelectric and dielectric characteristics were investigated according to the $SrTiO_3$ substitution. $SrTiO_3$ substitution enhanced density, dielectric constant(${\varepsilon}_r$) and electromechanical coupling factor($k_p$). However, mechanical quality factor was deteriorated. And also, Curie temperature ($T_c$), and phase transition temperature($T_p$) were rapidly decreased. At the 0.5 mol% $SrTiO_3$ substitution, density, electromechanical coupling factor($k_p$), dielectric constant(${\varepsilon}_r$) and piezoelectric constant($d_{33}$) of specimen showed the optimum value of $4.437\;g/cm^3$, 0.457, 1294, 265 pC/N, respectively.
Keywords
Lead-free ultrasonic motor; Electromechanical coupling factor; Piezoelectric constant;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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