Patent ID: 8022604
Filing Date: 2011-09-20
Classification: C01G,C01P,C04B,H01L

Abstract:
1. A piezoelectric/electrostrictive ceramic composition having a composition wherein Li, Na, and K are contained as first elements; Nb and Ta are contained as second elements; O is contained as a third element; a ratio of the total number of atoms of said first elements to the total number of atoms of said second elements is higher than 1; and the ratio of the number of Ta atoms to the total number of atoms of said second elements is between 30 mol % or more and 50 mol % or less as a whole, said composition (1) comprising a perovskite type oxide wherein said first elements are A site composing elements and said second elements are B site composing elements, and (2) being represented by the general formula {Li y (Na 1-x K x ) 1-y } a (Nb 1-z Ta z )O 3 wherein a, x, y and z respectively satisfy 1<a≦1.05, 0.30≦x≦0.70, 0.02≦y≦0.10 and 0.3≦z≦0.5.