| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic lowering its phase transition point from an orthorhombic to a tetragonal system below room temperature, which becomes problematic in commercialization of niobate-based piezoelectric ceramics. <P>SOLUTION: The piezoelectric ceramic mainly comprises a perovskite compound including Na, K, Li, Sr, Nb and Ti as main components and further, the values of (x) and (y) are 0.42≤x≤0.50 and 0.06≤y≤0.12, respectively when defining its composition formula by molar ratio as [(1-x-y)KNbO<SB>3</SB>+xNaNbO<SB>3</SB>+y(LiNbO<SB>3</SB>+SrTiO<SB>3</SB>)]. Thereby, new niobate-based piezoelectric ceramics, piezoelectric elements and piezoelectric members which are lead-free and low environmental load types can be produced and provided by using the above ceramic. <P>COPYRIGHT: (C)2007,JPO&INPIT |
