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J. Korean Ceram. Soc. > Volume 48(5); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(5): 467.
doi: https://doi.org/10.4191/kcers.2011.48.5.467
Ta 치환에 따른 비납계 (Na0.53K0.47)(Nb1-xTax)O3 세라믹의 압전 및 유전 특성
이정훈, 류경현, 성연수, 조종호, 송태권, 김명호
창원대학교 나노신소재공학부
Effects of Ta Substitution on Dielectric and Piezoelectric Properties of Pb-free (Na0.53K0.47)(Nb1-xTax)O3 Ceramics
Jung-Hoon Lee, Gyung-Hyun Ryu, Yeon-Soo Sung, Jong-Ho Cho, Tae-Kwon Song, Myong-Ho Kim
School of Nano & Advanced Materials Engineering, Changwon National University
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.
Key words: PPT, Pb-free, NKNT
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