Browse > Article
http://dx.doi.org/10.4313/JKEM.2011.24.11.870

Evaluation of Microstructure and Electrical Properties in (Na,K)NbO3-Based Pb-free Piezoelectrics Doped with Various Cu2O Concentration  

Lee, Youn-Ki (Department of Materials Engineering/ReSEM, Chungju National University)
Ryu, Sung-Lim (Department of Materials Engineering/ReSEM, Chungju National University)
Kweon, Soon-Yong (Department of Materials Engineering/ReSEM, Chungju National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.24, no.11, 2011 , pp. 870-875 More about this Journal
Abstract
The $(Na_{0.52}K_{0.44})(Nb_{0.9}Sb_{0.06})O_3-0.04dLiTaO_3$ (NKNS-LT) ceramics with various $Cu_2O$ concentration were prepared by the conventional solid state reaction method. The $Cu_2O$ content was varied in the range of 0.1~0.4 wt%. The effects of Cu on microstructure, crystallographic phase transition, and piezoelectric properties were investigated. The material with perovskite structure had a tetragonal phase (T1) when $Cu_2O$ concentration was less than 0.3 wt% and it transformed to another tetragonal phase (T2) when the $Cu_2O$ amount was greater than 0.3 wt%. The phase boundary between T1 and T2 phases appeared at around 0.3 wt% of $Cu_2O$ concentration. The piezoelectric properties were shown the maximum values at the composition of the phase boundary. The electro-mechanical coupling factor ($k_p$) was 0.42 and the piezoelectric charge constant ($d_{33}$) was 245 pC/N at the 0.3 wt% of $Cu_2O$ concentration.
Keywords
Lead-free ceramics; Piezoelectric properties; Phase boundary; $Cu_2O$ additive;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 H. Y. Park, J. Y. Choi, M. K. Choi, K. H. Cho, S. Nahm, H. G. Lee, and H. W. Kang, J. Am. Ceram. Soc., 91, 2374 (2008).   DOI
2 J. Fu, R. Zuo, X. Fang, and K. Liu, Mater. Res. Bull., 44, 1188 (2009).   DOI
3 IEEE Standards Board, IEEE Standards on Piezoelectricity, IEEE Standard, 176 (1978).
4 E. Ringgaard and T. Wurlitzer, J. Eur. Ceram. Soc., 25, 2701 (2005).   DOI
5 Y. G. Lv, C. L. Wang, J. L. Zhang, and J. P. Xu, Mater. Res. Bull., 44, 284 (2009).   DOI
6 Standard test method for water absorption, bulk density, apparent porosity, and apparent specific gravity for fired whiteware products, ASTM, C373-72 (1994).
7 J. F. Shackelford, Introduction to Materials Science for Engineers, 7th ed. (Prentice Hall, NJ, 2009) p. 27.
8 S. L. Ryu, K. H. Chung, J. H. Yoo, B. Y. Lee, and Y. H. Jeong, J. KIEEME, 18, 821 (2005).
9 C. W. Ahn, H. Y. Park, S. Nahm, H. G. Lee, and H. J. Lee, Sensor. Actuat., A136, 255 (2007).
10 Y. Saito, H. Takao, T. Tani, T. Nonoyama, K. Takatori, T. Homma, T. Nagaya, and M. Nakamura, Nature, 432, 84 (2004).
11 S. H. Lee, S. D. Baek, D. H. Lee, S. G. Lee, and Y. H. Lee, J. KIEEME, 24, 636 (2011).
12 K. S. Lee and J. H. Yoo, J. KIEEME, 24, 728 (2011).