1. 1 Y. Saito , H. Takao , T. Tani , T. Nonoyama , K. Takatori , T. Homma , T. Nagaya , and M. Nakamura , “Lead-Free Piezoceramics,” Nature (London), 432, 84-7 (2004).
2. 2 M. Matsubara , T. Yamaguchi , W. Sakamoto , K. Kikuta , T. Yogo , and S. Hirano , “Processing and Piezoelectric Properties of Lead-Free (K,Na) (NbTa)O3 Ceramics,” J. Am. Ceram. Soc., 88, 1190-6 (2005).
3. 3 J. Yoo , K. Lee , K. Chung , S. Lee , K. Kim , J. Hong , S. Ryu , and C. Lhee , “Piezoelectric and Dielectric Properties of (LiNaK)(NbTaSb)O3 Ceramics with Variation in Poling Temperature,” Jpn. J. Appl. Phys., 45, 7444-8 (2006).
4. 5 Y. Dai , X. Zhang , and G. Zhu , “Phase Transitional Behavior in K0.5Na0.5NbO3-LiTaO3 Ceramics,” Appl. Phys. Lett., 90, art. no. 262903 (2007).