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http://dx.doi.org/10.4191/kcers.2011.48.5.467

Effects of Ta Substitution on Dielectric and Piezoelectric Properties of Pb-free (Na0.53K0.47)(Nb1-xTax)O3 Ceramics  

Lee, Jung-Hoon (School of Nano & Advanced Materials Engineering, Changwon National University)
Ryu, Gyung-Hyun (School of Nano & Advanced Materials Engineering, Changwon National University)
Sung, Yeon-Soo (School of Nano & Advanced Materials Engineering, Changwon National University)
Cho, Jong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
Song, Tae-Kwon (School of Nano & Advanced Materials Engineering, Changwon National University)
Kim, Myong-Ho (School of Nano & Advanced Materials Engineering, Changwon National University)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.5, 2011 , pp. 467-470 More about this Journal
Abstract
Pb(Zr,Ti)$O_3$ (PZT) based ceramics with superior piezoelectric properties have been extensively used in various domestic and industrial appliances. However, PZT ceramics causing environmental contamination and health problems need to be eventually replaced by any of Pb-free materials. $(Na_{0.53}K_{0.47})(Nb_{1-x}Ta_x)O_3$ (NKNT), one of Pb-free piezoelectric ceramics, has long been known but its properties are not fully understood and developed. In this study, dielectric and piezoelectric properties of Pb-free NKNT ceramics were studied with Ta substitution for B-site at x = 0~0.6. It was found that polymorphic phase transition (PPT) between orthorhombic and tetragonal phases was notably influenced by Ta substitution. The highest piezoelectric coefficient ($d_{33}$) of 284 pC/N was occurred at x = 0.45.
Keywords
PPT; Pb-free; NKNT;
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