1. 1 J. Rödel , W. Jo , K. Seifert , E. M. Anton , and T. Granzow , “Perspective on the Development of Lead-Free Piezoceramics,” J. Am. Ceram. Soc., 92 [6] 1153-77 (2009).
2. 2 Y. Guo , K. Kakimoto , and H. Ohsato , “Na0.5K0.5NbO3-LiTaO3 Lead-Free Piezoelectrics,” Mater. Lett., 59, 241-4 (2005).
3. 3 T. A. Skidmore and S. J. Milne , “Phase Development During Mixed-Oxide Processing of a [Na0.5K0.5NbO3](1−x)-[LiTaO3](x) Powder,” J. Mater. Res., 22, 2265-72 (2007).
4. 4 Y. Saito , H. Takao , T. Tani , T. Nonoyama , K. Takatori , T. Homma , T. Nagaya , and M. Nakamura , “Lead-Free Piezoceramics,” Nature, 432, 84-7 (2004).
5. 5 S. J. Zhang , R. Xia , and T. R. Shrout , “Modified Na0.5K0.5NbO3 Based Lead-Free Piezoelectrics with Broad Usage Range,” Appl. Phys. Lett., 91, 132913 (2007).