Patent ID: 9590168
Date: 2017-03-07
CPC Classifications: C04B,H01L

Claim:
1. A method for making an alkali niobate-based piezoelectric material having the general formula {(K 1-a Na a ) 1-b Li b }(Nb 1-c-d Ta c Sb d )O 3 +x mol % Ba n TiO 3 +y mol % CuO where 0.35<a<0.65, 0.03≦b≦0.15, 0.05≦c≦0.25, 0≦d≦0.01 or 0.03≦d≦0.06, 2.0≦x≦4.0, 1.0≦y≦3.0, and 0.95≦n≦1.05, and having characteristics of: an electromechanical coupling coefficient Kp≧25%, a relative dielectric constant εr≧800, and a mechanical quality factor Qm≧800, the method comprising: mixing a solvent and a raw material of a compound that is the piezoelectric material; primary-heating a mixture of the solvent and the raw material of the compound, at a temperature lower than a sintering temperature; forming into a certain shape the primary-heated mixture in which a binder is added; and heating the shaped product to sinter in an atmosphere consisting of oxygen.