Piezoelectric ceramic composition and piezoelectric ceramic device using the same

Abstract

The present invention provides a piezoelectric ceramic composition having the formula: {[Pb(1−1.5x)±(0˜0.2)Lax][Ti(1−y−z)MnyCUz]O3} which meets the requirements: 0.02<x<0.14, 0.01≦y<0.04, and 0.002≦z≦0.008. The piezoelectric ceramic composition of the present invention can be stably sintered under normal atmosphere. That is, there is no need for an oxygen partial pressure to be 80% or more. Furthermore, the composition exhibits excellent piezoelectric property and thermal stability. Accordingly, the piezoelectric ceramic composition of the present invention has excellent piezoelectric property at a thickness longitudinal third harmonic frequency capable of producing a high frequency of 15 MHz or more, and can be used as a material of a piezoelectric ceramic device with a small electrode area.

Dependencies are inferred from the claim text.