abstract |
The stacked-type actuator includes electrodes disposed to be spaced apart from each other, and a lead-free piezoelectric material interposed between the electrodes, and the lead-free piezoelectric material has the following chemical formula (1). [Chemical Formula 1] Na x K 1-x Nb 1-y (Cu, Mn) y O 3 wherein x is 0 ≦ x ≦ 0.5 and y has a composition range of 0 <y ≦ 0.1. |